A few games sort of came back, one way or another.
Galcon got a sequel, for instance (here).
Zap! got a spiritual successor known as BitFighter. Lore: Dark Horizons is a sequel to Lore: Aftermath.
ThinkTanks can be purchased and played for $7 here. There's a relatively active community for the game here.
No idea what's going on with the Ace of Aces / Red Baron thing. Last I heard Damon Slye still wants to make it. They released a classic pack on Steam, but doesn't include the InstantAction game.