Lazarus is the class libraries for Free Pascal that emulate Delphi. Free Pascal is a GPL'ed compiler that runs on Linux, Win32, OS/2, 68K and more. Free Pascal is designed to be able to understand and compile Delphi syntax, which is of course OOP. Lazarus is the part of the missing puzzle that will allow you to develop Delphi like programs in all of the above platforms. Unlike Java which strives to be a write once run anywhere, Lazarus and Free Pascal strives for write once compile anywhere. Since the exact same compiler is available on all of the above platforms it means you don't need to do any recoding to produce identical products for different platforms.

aPLib is a 32-bit compression library based on the compression algorithm used in aPACK (my executable compressor). aPLib is an easy-to-use alternative to many of the heavy-weight compression libraries available.

Rails is a full-stack framework for developing database-backed web applications according to the Model-View-Control pattern. From the Ajax in the view, to the request and response in the controller, to the domain model wrapping the database, Rails gives you a pure-Ruby development environment. To go live, all you need to add is a database and a web server.

The new standalone build system makes udis86 usable and embeddable in kernel code (or other environments which, say, lack libc).

Udis86 is an easy-to-use minimalistic disassembler library (libudis86) for the x86 and AMD64 (x86-64) range of instruction set architectures. The primary intent of the design and development of udis86 is to aid software development projects that entail binary code analysis.

#ziplib (SharpZipLib, formerly NZipLib) is a Zip, GZip, Tar and BZip2 library written entirely in C# for the .NET platform. It is implemented as an assembly (installable in the GAC), and thus can easily be incorporated into other projects (in any .NET language). The creator of #ziplib put it this way: "I've ported the zip library over to C# because I needed gzip/zip compression and I didn't want to use libzip.dll or something like this. I want all in pure C#."

BASS is an audio library for use in Windows and Mac OSX software. Its purpose is to provide developers with the most powerful and efficient (yet easy to use), sample, stream (MP3, MP2, MP1, OGG, WAV, AIFF, custom generated, and more via add-ons), MOD music (XM, IT, S3M, MOD, MTM, UMX), MO3 music (MP3/OGG compressed MODs), and recording functions. All in a tiny DLL, under 80KB* in size. On Windows, BASS requires DirectX 3 or above for output, and takes advantage of DirectSound and DirectSound3D hardware accelerated drivers, when available. On OSX, BASS uses CoreAudio for output, and OSX 10.3 or above is recommended. Both PowerPC and Intel Macs are supported. C/C++, Delphi, Visual Basic and MASM APIs are provided, with tons of examples and plugins to support a plethora of different formats. Other APIs are also available.

Ultimate++ is a C++ cross-platform rapid application development suite. It includes a set of libraries (GUI, SQL, etc..), and an integrated development environment.

Rapid development is achieved by the smart and aggressive use of C++ rather than through fancy code generators. In this respect, U++ competes with popular scripting languages while preserving C/C++ runtime characteristics.

Functions for number of crytographic, hash, and checksum algorithms.

• Hashes: md4, md2, rmd128, rmd160, rmd256, rmd320, sha0, sha1, sha256, sha384, sha512, tiger, whirlpool haval, md5
• Checksums: crc32, crc16, adler
• Ciphers: tea, xtea, rc2, rc4, rc5, rc6, blowfish, 3-Way rijndael, DES

Written in ASM, source code included. 

Detours is a library for instrumenting arbitrary Win32 functions on x86 machines. Detours intercepts Win32 functions by re-writing target function images. The Detours package also contains utilities to attach arbitrary DLLs and data segments (called payloads) to any Win32 binary.

Xmusic is a dynamic linking library that provides a function to play XM music file easier.