Miner 2049er
Big Five Software, makers of my favorite platform game ever (Miner 2049er), released both Miner 2049er and Bounty Bob Strikes Back for free using a custom emulator:
“The design is completely object-oriented; there are objects for all of the Atari chips, RAM, ROM, CPU, bus, etc. I put great effort into writing code that could be well optimized by the compiler.
Miner or Bounty Bob never relied on any code from the Atari system ROM so it isn’t included in this program, It’s a fairly complete Atari Emulation system and would probably run other games if I were to try.”
It’s probably been there for ages, but it’s new to me. Their web site has a bunch of historical information about this great company, including a clip from their appearance on Good Morning America, that you must watch. Hard to believe these guys are only a few years older than me, considering I was just a kid when I was avoiding their radioactive mutants.