Being able to publish source code that you wrote while working for a now dead company seems like a good one. I thought this had resonance with the last post I made about buying stuff from Spike. Whether the source code has more value than a virtual fish tank will take more time to find out than I want to spend. The current source code published at a Not Invisible Worlds site called Mappa Mundi (itself an old magazine web site) is Alkindi Collaborative Filtering and Space Mapper.
You can add using makefiles to compile Java code to the list of signs that a company will go under: