Sort of like the recent "Stop killing videogames" iniciative, where players are imploring AAA game dev firms to stop shutting down the servers that games need, when they think the games aren't profitable anymore.
The initiative basically encourages these companies to open source their games, even in a controlled manner, allowing them to retain some oversight over what can and can't be done. That would enable players to continue enjoying the games long after their official shutdown. There are a lot of games that remain highly playable, with communities thriving decades after these games were released, such as King of Fighters, Age of Empires, GTA San Andreas, and I'm sure others here can name a few too.
Building on that idea, this forum could serve as a platform for other software packages facing a similar fate: programs whose developers are no longer willing to maintain them, yet whose user base is eager to keep them alive.