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Alpha

Minecraft Alpha is the latest (and only updated) version of Minecraft which requires a paid account to download, update and play. Most of the new development projects focus on either creating entirely new programs from scratch that interoperate with Minecraft (such as a bot or server) or modding projects that wrap the client or server and provide bug fixes, new features and enhancements to existing features.

Documentation

There are ongoing efforts to keep reverse engineered documentation updated, but it isn't as easy as it sounds. The protocol generally changes with each release, and both the Client and Server classes get rearranged on each release. Below are links to the current documentation segments, which may or may not be accurate.

• Protocol Specification
• Protocol FAQ
• Authentication Scheme
• Map Format

Source Code & Snippets

Source code snippets provide insight into how specific features work or can be accomplished, and by themselves are generally free to use in your own program.

• Skins.php, a script to generate a preview image from a Minecraft skin file (PHP).
• MC-Ver, a simple script that monitors for the game client to change versions, and reports the change via http://cia.vc/ (Python).
• More...

Tools and Mods

• Clients - third-party SMP clients.
• Servers - third-party SMP servers.
• Libraries - libraries to interface with Minecraft data files or network protocols.
• Utilities - tools that interface with a client, server, or data files, such as proxies, bots, mods, or inventory editors.

For more info, check out Minecraft Alpha.

Classic

Minecraft Classic is the original version of Minecraft, available for free to the public. It's still available off of the main website today and is still played by many people, with an active development community. As it's been around for almost a year, and because it's so simplistic, there are many, many programs made to work with Classic - there are over 18+ servers alone, written in everything from C++ to PureBasic to Perl. It's highly recommend if you're planning to do a development project at this point to instead look into the Minecraft Alpha specifications.

Documentation

As there is no longer any work being done on classic, the documentation for it is stable. If you create something that works with it, it probably always will.

• Protocol Specification
• Server Map Format (.dat)
• Saved Level Format (.mclevel)

Source Code Snippets

Source code snippets provide insight into how specific features work or can be accomplished, and by themselves are generally free to use in your own program.

• Deserializing the level.dat file format (C, C#)
• Skins.php, a script to generate a preview image from a Minecraft skin file (PHP).
• More...

Tools and Mods

Useful information & links

• Clients - third-party Classic clients.
• Servers - third-party Classic servers.
• Libraries - libraries to interface with Minecraft data files or network protocols.
• Utilities - tools that interface with a client, server, or data files, such as proxies or bots.

For more info, check out Minecraft Classic.