A curated list of legacy systems with publicly available source code
- Apollo-11 guidance computer
- PDP-10 Incompatible Timesharing System
- Prince of Persia - Apple II version
- MS-DOS - Versions 1.X and 2.0
- Commodore Source Code (BASIC, DOS and KERNEL)
- QuickDraw and MacPoint
- ET - The Extraterrestrial - Atari 2600
- NCSA Mosaic
- Mozilla (the open sourced version of Netscape Navigator)
- Wolfenstein 3D
- DOOM
- Quake
- Microsoft Word for Windows 1.1a
- Tennis
- Bad Fruit from Peel & Slice ( practice )
- Guilded Rose (practice)
- ChartSmart ( practice )
- triva (practice)
- Apache-Solr (real)