6502bench SourceGen

SourceGen is an industrial-strength disassembler for the 6502 family of CPUs, including the 65C02 and 65816. A complete list of features can be found on the project site.

Full source code is available on github.

CiderPress

CiderPress is a Windows utility for managing Apple II disk images and file archives. Full details can be found on the project site.

Orginally sold as shareware, it's now an open-source project available on github.