Convergence is an All New Episode Singleplayer Mission Addon Mod, spaning over six maps per character. Play as Sisko, Kira and Worf.
Full German Review here: Youtu.be
Short english summary:
This mod is exactly what The Fallen was missing: Endgame content. Convergence provides one big, long mission where you gradually obtain weapons, encounter most enemy types and can just go wild for a bit.
There are two caveats to keep in mind, though:
1) A few items behave differently. Notably, some keycards are removed after you use them. If you need a card twice in one level and it was removed the first time you used it, there is a second copy of it somewhere!
2) Unlike what the ReadMe claims, you can safely use cheats if you are so inclined, as long as you don't do any sequence-breaking. Additionally, you MUST avoid skipping levels through cheats - this messes up the inventory transfers between characters and can result in missions becoming unplayable due to you not being given quest items.
Keeping those two things in mind, Convergence can give you more of The Fallen. It's just sad that the official website is long gone and this project hasn't inspired anything like for this game.