Welcome

PC/Geos / #FreeGEOS - reviving a 1990s operating system and GUI

• Browser-based Live Demo: English / German -- How it works
• Tools for Geos Development
• Old programs for Geos: Desktop / GeoBook / CASIO Zoomer
• Nokia's Geos-based smartphone: Nokia 9000/9000i/9110 Communicator [Deutsch]
• Hewlett Packard's PDA: HP OmniGo 100/120
• Brother's Netbook: GeoBook and Super PowerNote Cheat Page
• Nathan Fiedler's unofficial Geos pages are now archived on this server. 

Graphics and Photography

• Rubik's Snake Simulation in three.js: First "vibe-coding" experiment
• Rubik's Snake Simulation in three.js: Rewritten with Gemini 3
• Sand picture simulation: Return to Dunes
• Panoramas and Anaglyphs [photoset on flickr]

Symbian / EPOC32 - experiments for Nokia's Symbian platform

• Proof-of-concept CPU usage monitoring

OS/2 - a few programs I wrote for OS/2

• Tools and documentation for the INF/HLP file format
• A simple "diff" file generator for the PATCH command
• MAKELOGO clone to compile new boot logos
• Running OS/2 commands from a DOS prompt

DOS - old DOS applications I developed a looong time ago.

• MemView - memory map viewer for MS-/DR-/Novell-DOS
• Compiler/decompiler for Borland Help Files
• "Return to Dunes" - sand picture simulation (graphics)

Miscellaneous

• Protocol documentation for the Casio WQV-1 Wrist Camera
• Things about Windows I learned the hard way - a collection of various PC-related things that took me a while to figure out, in the hope of making them easier to find for others
• Some little-known facts about Windows 32-bit heap management
• cibyl - an open-source C-to-Java bytecode translator by Simon Kagstrom that I have made a few contributions to. Based on this project, Meir Tsvi has developed an interesting experimental fork of cibyl that does C-to-MSIL bytecode translation, for cases where porting to C# or "managed C" is not an option for creating Windows Phone 7 apps (such as the Waze crowd-sourced navigation app)
• Retrocomputing: some games for the TI-99/4A on github