Hammer of Thyrion (uHexen2) is a cross-platform port of Raven Software's Hexen II source. It is based on an older linux port, Anvil of Thyrion. HoT includes countless bug fixes, improved music, sound and video modes, opengl improvements, support for many operating systems and architectures, and documentation among many others.
Versatile Commodore Emulator
VICE is an emulator collection which emulates the C64, the C64-DTV, the C128, the VIC20, practically all PET models, the PLUS4 and the CBM-II (aka C610). It runs on Unix, MS-DOS, Win32, OS/2, Acorn RISC OS, BeOS, QNX 6.x, Amiga, GP2X or Mac OS X machines.
Emulator of Atari 800/800XL/130XE/5200 with various extensions (1088kB RAM, stereo sound and much more) running on just about every operating system (Unix/Linux, Windows, DOS, TOS, MacOS, Workbench, WinCE...)
uCON64 is a tool to backup all kinds of video games. It supports almost every available backup unit for cartridge-based consoles and performs many other tasks like ROM hacking.
CGUI - a gui lib for multiplatform
Wcd is another Norton Change Directory (NCD) clone. Wcd is a command-line program to change directory fast. It includes a full screen interactive directory tree browser with speed search and a fast way to choose between multiple matches.
"Tegel" is an add-on for Allegro (alleg.sf.net) for drawing and handling layered tilemaps. The package contains an editor and a playback library in C. There is support for multiple layers, rotated and/or animated tilemaps.
LaTeX to RTF convertor that handles equations, figures, and cross-refe
Latex2rtf tries to convert your LaTeX file into a RTF file for opening in Microsoft Word. The general idea is to try and get the things that computers are good at correct: character conversion, graphic conversion, etc. Page layout suffers because control in RTF is pretty pathetic compared to TeX. Consequently, it is likely that manual reformatting will be needed. Translation of bibliographies is pretty good and a wide range of styles are handled, but you must typeset your LaTeX file to create the needed .aux and .bbl files first. Translation of equations used to be excellent: it used to be possible to double-click equations in Word and then edit with MathType. Unfortunately, this conversion in Word has gotten progressively worse over the years (I changed nothing!). Unfortunately, the only solution is to converting to MTEF objects, which is a major rewrite (but would make OpenOffice users much happier.) Volunteers welcome!
Dos2Unix / Unix2Dos - Text file format converters
dos2unix includes utilities to convert text files with DOS or MAC line breaks to Unix line breaks and vice versa. It also includes conversion of UTF-16 to UTF-8.
NorQualizer is a smart audio equalizer/normalizer which corrects audio files to get them all similar in terms of bandwidth and volume level. Especially useful for preparing audio CDs with files from different sources.
PTCPas is a free, portable framebuffer library, written in Free Pascal. It allows low-level high-speed graphics access on multiple platforms.
BEYE (Binary EYE) is a free, portable, advanced file viewer with built-in editor for binary, hexadecimal and disassembler modes. It contains a highlight AVR/Java/i86-AMD64/ARM-XScale/PPC-64 and other disassembler, full preview of MZ,NE,PE,ELF and other.
NATIVE is a project aimed at producing a version of the C# language compiler which omits native-code for various OS platforms. NATIVE does not target the CLI or use the CLR.
Golf Handicap Tracker (GHT) allows one or more golfers to keep track of their handicap. Originally written in 1991 at the request of my brother in-law Dave, it has been GPL'ed in the hopes of making it Über portable.
Info-ZIP portable compression/archiver utilities (Zip, UnZip, WiZ, etc.)
CPRI - a lib with an API in C for easy printing of reports to printer or html. Multiple platforms. Based on CGUI and Allegro.
CBAR - a bar code reader lib
CCOM - a lib for serial port interface
WAV Speech Enhancer can be used to improve the signal to noise ratio of bad quality speech recordings: - Dynamic expansion - Pink noise attenuation - Low frequency noise (50-60Hz) suppression
Free 32/64/16-bit multi-platform Pascal and Object Pascal compiler
A 32/64/16-bit Pascal compiler for Win32/64/CE, Linux, Mac OS X/iOS, FreeBSD, OS/2, Game Boy Advance, Nintendo NDS and DOS; semantically compatible with Delphi, Borland Pascal and Mac Pascal (partially) with extra features, e.g. operator overloading.
Mikmod is a module player and library supporting many formats, including mod, s3m, it, and xm. Originally a player for MS-DOS, MikMod has been ported to other platforms, such as Unix, Macintosh, BeOS, and Java(!!)
The FreeDOS Edlin project is the standard line editor in the FreeDOS operating system.
A promising chess program
A text based chess program with interface to XBoard and UCI protocol. For access to code, please clone the git repository. Version 0.2.x and 0.9.x are written in C. Version 0.3.x till 0.6.x are written in C++. Unfortunately, I never got the C++ version to compile properly on all platforms. So from version 0.9.0, the code is back to plain old CC.
IRE is a tile-based Computer Role-Playing Game engine based on Ultima 6, but with an emphasis on customisation and cross-platform support. Everything is controlled using scripts.