ProTecTProTecT is an MS-DOS packer. While this packer is outdated, it uses a number of interesting anti-analysis techniques that are still relevant today.
CobaltCobalt is a FreeDOS distribution designed to be light, simple and easy to use.
costaThe Costa Graphical User Interface for MS-DOS and compatible systems
jSHA Javascript scripting engine for DOS
dd86No longer maintained. See URL.
monobitTools for working with monochrome bitmap fonts