diff --git a/.classpath b/.classpath
index b9ad5b8a..c81123b9 100644
--- a/.classpath
+++ b/.classpath
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
 	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="src" path="src-devtools"/>
 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.6"/>
 	<classpathentry kind="con" path="org.eclipse.jdt.junit.JUNIT_CONTAINER/4"/>
 	<classpathentry kind="lib" path="lib/JGoogleAnalytics_0.4.jar"/>
diff --git a/src-devtools/amidst/devtools/MinecraftJarDownloadAvailabilityChecker.java b/src-devtools/amidst/devtools/MinecraftJarDownloadAvailabilityChecker.java
new file mode 100644
index 00000000..03e0718b
--- /dev/null
+++ b/src-devtools/amidst/devtools/MinecraftJarDownloadAvailabilityChecker.java
@@ -0,0 +1,33 @@
+package amidst.devtools;
+
+import java.io.IOException;
+
+import amidst.devtools.mojangapi.Version;
+import amidst.devtools.mojangapi.Versions;
+import amidst.devtools.utils.VersionStateRenderer;
+
+import com.google.gson.JsonIOException;
+import com.google.gson.JsonSyntaxException;
+
+public class MinecraftJarDownloadAvailabilityChecker {
+	public static void main(String[] args) throws JsonSyntaxException,
+			JsonIOException, IOException {
+		new MinecraftJarDownloadAvailabilityChecker(Versions.retrieve())
+				.displayDownloadAvailability();
+	}
+
+	private VersionStateRenderer renderer = new VersionStateRenderer();
+	private Versions versions;
+
+	public MinecraftJarDownloadAvailabilityChecker(Versions versions) {
+		this.versions = versions;
+	}
+
+	public void displayDownloadAvailability() {
+		for (Version version : versions.getVersions()) {
+			boolean hasServer = version.hasServer();
+			boolean hasClient = version.hasClient();
+			System.out.println(renderer.render(version, hasServer, hasClient));
+		}
+	}
+}
diff --git a/src-devtools/amidst/devtools/MinecraftJarDownloader.java b/src-devtools/amidst/devtools/MinecraftJarDownloader.java
new file mode 100644
index 00000000..ee87e326
--- /dev/null
+++ b/src-devtools/amidst/devtools/MinecraftJarDownloader.java
@@ -0,0 +1,37 @@
+package amidst.devtools;
+
+import java.io.IOException;
+
+import amidst.devtools.mojangapi.Version;
+import amidst.devtools.mojangapi.Versions;
+import amidst.devtools.settings.DevToolsSettings;
+import amidst.devtools.utils.VersionStateRenderer;
+
+import com.google.gson.JsonIOException;
+import com.google.gson.JsonSyntaxException;
+
+public class MinecraftJarDownloader {
+	public static void main(String[] args) throws JsonSyntaxException,
+			JsonIOException, IOException {
+		new MinecraftJarDownloader(
+				DevToolsSettings.INSTANCE.getMinecraftVersionsDirectory(),
+				Versions.retrieve()).downloadAll();
+	}
+
+	private VersionStateRenderer renderer = new VersionStateRenderer();
+	private String basePath;
+	private Versions versions;
+
+	public MinecraftJarDownloader(String basePath, Versions versions) {
+		this.basePath = basePath;
+		this.versions = versions;
+	}
+
+	public void downloadAll() {
+		for (Version version : versions.getVersions()) {
+			boolean hasServer = version.tryDownloadServer(basePath);
+			boolean hasClient = version.tryDownloadClient(basePath);
+			System.out.println(renderer.render(version, hasServer, hasClient));
+		}
+	}
+}
diff --git a/src-devtools/amidst/devtools/MinecraftVersionCompatibilityChecker.java b/src-devtools/amidst/devtools/MinecraftVersionCompatibilityChecker.java
new file mode 100644
index 00000000..0df9045a
--- /dev/null
+++ b/src-devtools/amidst/devtools/MinecraftVersionCompatibilityChecker.java
@@ -0,0 +1,78 @@
+package amidst.devtools;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import amidst.Util;
+import amidst.clazz.Classes;
+import amidst.clazz.translator.ClassTranslator;
+import amidst.devtools.mojangapi.Version;
+import amidst.devtools.mojangapi.Versions;
+import amidst.devtools.settings.DevToolsSettings;
+import amidst.minecraft.local.LocalMinecraftInterfaceBuilder;
+
+import com.google.gson.JsonIOException;
+import com.google.gson.JsonSyntaxException;
+
+public class MinecraftVersionCompatibilityChecker {
+	public static void main(String[] args) throws JsonSyntaxException,
+			JsonIOException, IOException {
+		new MinecraftVersionCompatibilityChecker(
+				DevToolsSettings.INSTANCE.getMinecraftVersionsDirectory(),
+				Versions.retrieve()).checkAll();
+	}
+
+	private String basePath;
+	private Versions versions;
+
+	public MinecraftVersionCompatibilityChecker(String basePath,
+			Versions versions) {
+		this.basePath = basePath;
+		this.versions = versions;
+	}
+
+	public void checkAll() {
+		initCreepyStuff();
+		List<Version> successful = new ArrayList<Version>();
+		List<Version> failed = new ArrayList<Version>();
+		for (Version version : versions.getVersions()) {
+			if (checkOne(version)) {
+				successful.add(version);
+			} else {
+				failed.add(version);
+			}
+		}
+		displayVersionList(successful,
+				"================ SUCCESSFUL VERSIONS ============");
+		displayVersionList(failed,
+				"================ FAILED VERSIONS ================");
+	}
+
+	private void initCreepyStuff() {
+		Util.setMinecraftDirectory();
+		Util.setMinecraftLibraries();
+	}
+
+	private boolean checkOne(Version version) {
+		if (version.tryDownloadClient(basePath)) {
+			try {
+				File jarFile = version.getLocalClientJarPath(basePath).toFile();
+				ClassTranslator translator = LocalMinecraftInterfaceBuilder.StatelessResources.INSTANCE.classTranslator;
+				return Classes.ensureExactlyOneMatches(jarFile, translator);
+			} catch (Exception e) {
+				e.printStackTrace();
+			}
+		}
+		return false;
+	}
+
+	private void displayVersionList(List<Version> versionList, String message) {
+		System.out.println();
+		System.out.println(message);
+		for (Version version : versionList) {
+			System.out.println(version.getId());
+		}
+	}
+}
diff --git a/src-devtools/amidst/devtools/mojangapi/Latest.java b/src-devtools/amidst/devtools/mojangapi/Latest.java
new file mode 100644
index 00000000..6e1d6a3e
--- /dev/null
+++ b/src-devtools/amidst/devtools/mojangapi/Latest.java
@@ -0,0 +1,14 @@
+package amidst.devtools.mojangapi;
+
+public class Latest {
+	private String snapshot;
+	private String release;
+
+	public String getSnapshot() {
+		return snapshot;
+	}
+
+	public String getRelease() {
+		return release;
+	}
+}
diff --git a/src-devtools/amidst/devtools/mojangapi/Version.java b/src-devtools/amidst/devtools/mojangapi/Version.java
new file mode 100644
index 00000000..a1613979
--- /dev/null
+++ b/src-devtools/amidst/devtools/mojangapi/Version.java
@@ -0,0 +1,156 @@
+package amidst.devtools.mojangapi;
+
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URI;
+import java.net.URL;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.HashMap;
+import java.util.Map;
+
+import amidst.utilties.URIUtils;
+
+public class Version {
+	private static enum StatelessResources {
+		INSTANCE;
+
+		private char defaultTypeChar = 'N';
+		private Map<String, Character> typeCharMap = createTypeCharMap();
+
+		private Map<String, Character> createTypeCharMap() {
+			HashMap<String, Character> result = new HashMap<String, Character>();
+			result.put("snapshot", 'S');
+			result.put("release", 'R');
+			result.put("old_beta", 'B');
+			result.put("old_alpha", 'A');
+			return result;
+		}
+
+		private char getTypeChar(String type) {
+			if (typeCharMap.containsKey(type)) {
+				return typeCharMap.get(type);
+			} else {
+				return defaultTypeChar;
+			}
+		}
+	}
+
+	private static final String DOWNLOAD_URL_PREFIX = "https://s3.amazonaws.com/Minecraft.Download/versions/";
+	private static final String DOWNLOAD_URL_MIDDLE_SERVER = "/minecraft_server.";
+	private static final String DOWNLOAD_URL_MIDDLE_CLIENT = "/";
+	private static final String JAR_FILE_EXTENSION = ".jar";
+	private static final String JSON_FILE_EXTENSION = ".json";
+
+	private String id;
+	private String type;
+
+	public String getId() {
+		return id;
+	}
+
+	public String getType() {
+		return type;
+	}
+
+	public char getTypeChar() {
+		return StatelessResources.INSTANCE.getTypeChar(type);
+	}
+
+	private String getServerLocation(String fileExtension) {
+		return DOWNLOAD_URL_PREFIX + id + DOWNLOAD_URL_MIDDLE_SERVER + id
+				+ fileExtension;
+	}
+
+	private String getClientLocation(String fileExtension) {
+		return DOWNLOAD_URL_PREFIX + id + DOWNLOAD_URL_MIDDLE_CLIENT + id
+				+ fileExtension;
+	}
+
+	public String getServerJarLocation() {
+		return getServerLocation(JAR_FILE_EXTENSION);
+	}
+
+	public String getClientJarLocation() {
+		return getClientLocation(JAR_FILE_EXTENSION);
+	}
+
+	public URI getServerJarURI() {
+		return URIUtils.newURI(getServerJarLocation());
+	}
+
+	public URI getClientJarURI() {
+		return URIUtils.newURI(getClientJarLocation());
+	}
+
+	public URL getServerJarURL() throws MalformedURLException {
+		return URIUtils.newURL(getServerJarLocation());
+	}
+
+	public URL getClientJarURL() throws MalformedURLException {
+		return URIUtils.newURL(getClientJarLocation());
+	}
+
+	public String getClientJsonLocation() {
+		return getClientLocation(JSON_FILE_EXTENSION);
+	}
+
+	public URI getClientJsonURI() {
+		return URIUtils.newURI(getClientJsonLocation());
+	}
+
+	public URL getClientJsonURL() throws MalformedURLException {
+		return URIUtils.newURL(getClientJsonLocation());
+	}
+
+	public boolean hasServer() {
+		return URIUtils.exists(getServerJarLocation());
+	}
+
+	public boolean hasClient() {
+		return URIUtils.exists(getClientJarLocation());
+	}
+
+	public void downloadServer(String basePath) throws MalformedURLException,
+			IOException {
+		URIUtils.download(getServerJarURL(), getLocalServerJarPath(basePath));
+	}
+
+	public void downloadClient(String basePath) throws MalformedURLException,
+			IOException {
+		URIUtils.download(getClientJarURL(), getLocalClientJarPath(basePath));
+		URIUtils.download(getClientJsonURL(), getLocalClientJsonPath(basePath));
+	}
+
+	public boolean tryDownloadServer(String basePath) {
+		try {
+			downloadServer(basePath);
+			return true;
+		} catch (MalformedURLException e) {
+		} catch (IOException e) {
+		}
+		return false;
+	}
+
+	public boolean tryDownloadClient(String basePath) {
+		try {
+			downloadClient(basePath);
+			return true;
+		} catch (MalformedURLException e) {
+		} catch (IOException e) {
+		}
+		return false;
+	}
+
+	public Path getLocalServerJarPath(String basePath) {
+		return Paths.get(basePath, "server", id + JAR_FILE_EXTENSION);
+	}
+
+	public Path getLocalClientJarPath(String basePath) {
+		return Paths.get(basePath, "client", id + JAR_FILE_EXTENSION);
+	}
+
+	public Path getLocalClientJsonPath(String basePath) {
+		return Paths.get(basePath, "client", id + JSON_FILE_EXTENSION);
+	}
+}
diff --git a/src-devtools/amidst/devtools/mojangapi/Versions.java b/src-devtools/amidst/devtools/mojangapi/Versions.java
new file mode 100644
index 00000000..664d4a64
--- /dev/null
+++ b/src-devtools/amidst/devtools/mojangapi/Versions.java
@@ -0,0 +1,31 @@
+package amidst.devtools.mojangapi;
+
+import java.io.IOException;
+import java.util.List;
+
+import amidst.utilties.URIUtils;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonIOException;
+import com.google.gson.JsonSyntaxException;
+
+public class Versions {
+	private static final Gson GSON = new Gson();
+	private static final String VERSIONS_URL = "https://s3.amazonaws.com/Minecraft.Download/versions/versions.json";
+
+	public static Versions retrieve() throws JsonSyntaxException,
+			JsonIOException, IOException {
+		return GSON.fromJson(URIUtils.newReader(VERSIONS_URL), Versions.class);
+	}
+
+	private Latest latest;
+	private List<Version> versions;
+
+	public Latest getLatest() {
+		return latest;
+	}
+
+	public List<Version> getVersions() {
+		return versions;
+	}
+}
diff --git a/src-devtools/amidst/devtools/settings/DevToolsSettings.java b/src-devtools/amidst/devtools/settings/DevToolsSettings.java
new file mode 100644
index 00000000..41a5a9fe
--- /dev/null
+++ b/src-devtools/amidst/devtools/settings/DevToolsSettings.java
@@ -0,0 +1,11 @@
+package amidst.devtools.settings;
+
+public enum DevToolsSettings {
+	INSTANCE;
+
+	private String minecraftVersionsDirectory = "/tmp/mc/";
+
+	public String getMinecraftVersionsDirectory() {
+		return minecraftVersionsDirectory;
+	}
+}
diff --git a/src-devtools/amidst/devtools/utils/VersionStateRenderer.java b/src-devtools/amidst/devtools/utils/VersionStateRenderer.java
new file mode 100644
index 00000000..a29959af
--- /dev/null
+++ b/src-devtools/amidst/devtools/utils/VersionStateRenderer.java
@@ -0,0 +1,18 @@
+package amidst.devtools.utils;
+
+import amidst.devtools.mojangapi.Version;
+
+public class VersionStateRenderer {
+	public String render(Version version, boolean hasServer, boolean hasClient) {
+		return toBox(hasServer, 'S') + " " + toBox(hasClient, 'C') + " "
+				+ version.getTypeChar() + " " + version.getId();
+	}
+
+	private String toBox(boolean value, char c) {
+		if (value) {
+			return "[" + c + "]";
+		} else {
+			return "[ ]";
+		}
+	}
+}
diff --git a/src/amidst/utilties/URIUtils.java b/src/amidst/utilties/URIUtils.java
new file mode 100644
index 00000000..6d0a41df
--- /dev/null
+++ b/src/amidst/utilties/URIUtils.java
@@ -0,0 +1,64 @@
+package amidst.utilties;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.URI;
+import java.net.URL;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardCopyOption;
+
+public enum URIUtils {
+	;
+
+	public static URI newURI(String location) {
+		return URI.create(location);
+	}
+
+	public static URL newURL(String location) throws MalformedURLException {
+		return URI.create(location).toURL();
+	}
+
+	public static BufferedReader newReader(String location) throws IOException {
+		return newReader(newURL(location));
+	}
+
+	public static BufferedReader newReader(URL url) throws IOException {
+		return new BufferedReader(new InputStreamReader(url.openStream()));
+	}
+
+	public static boolean exists(String location) {
+		try {
+			return exists(newURL(location));
+		} catch (MalformedURLException e) {
+			return false;
+		}
+	}
+
+	public static boolean exists(URL url) {
+		try {
+			HttpURLConnection connection = (HttpURLConnection) url
+					.openConnection();
+			connection.setRequestMethod("HEAD");
+			return connection.getResponseCode() == HttpURLConnection.HTTP_OK;
+		} catch (IOException e) {
+			return false;
+		}
+	}
+
+	public static void download(URL from, Path to) throws IOException {
+		to.getParent().toFile().mkdirs();
+		if (to.toFile().exists()) {
+			return;
+		}
+		Path part = Paths.get(to.toString() + ".part");
+		InputStream in = from.openStream();
+		Files.copy(in, part, StandardCopyOption.REPLACE_EXISTING);
+		Files.move(part, to, StandardCopyOption.REPLACE_EXISTING);
+	}
+}