These are some interesting mods that come to mind for JKA. I was inspired to share these after the fan game thread a few days ago:

Escape from Yavin 4: The big selling point of this one is the varieties of lightsaber you can use. You get the typical ones, sure - single blade, double blade. But you also get some cool ones like a circle one that has the blades coming out of the sides of the circle. There's also one that resembles a mace with a bunch of blades poking out of the top. The game also goes on for a decent amount of time, so there are a lot of bad guys to use the cool new lightsabers on.

Dark Alliance Trilogy (The Mainframe, The Dark Alliance, The Dark Alliance II: Vengeance): The first two mods for these are actually for Outcast, but they're good nonetheless. The idea behind this one is that Vader is somehow back in action and causing trouble. It seems to splinter off from canon somewhere between Outcast and Academy (considering Kyle has access to the Force, but Tavion is still alive during the trilogy). It can amuse for an afternoon.

Galactic Legacy: This one focuses on What Ifs during the prequels. The Duels of the Fates one is the most extensive, since you get a few extra levels after the initial one to see the effects of your favored character winning. Some notable things about the missions:

• Duel of the Fates: Three options. You can play as Obi Wan (canon ending), Qui Gon (who slays Maul), and Maul (who wins by killing both Jedi). Maul's variant is my favorite of the bunch.
• Fate of the Republic: Two options between Palpatine or Windu. Palpatine's variant isn't too interesting, but playing as Windu gives him the situational awareness to keep his hand. He lives to see Order 66 this time around.
• Knightfall: Three options. Anakin, Cin Drallig (dude on standby at the Temple), and a nameless clone trooper. Drallig is the one who brings a change in timeline, though this stage is a bit difficult - a bunch of the clones are packing rocket launchers.

Galactic Legacy also lets you play as a bunch of Star Wars characters, including characters that only appear in the books.

Movie Duels: This one is similar to Galactic Legacy, but with some important differences. Firstly, it has more missions at the cost of shorter What Ifs. For example, you can play as Kylo Ren and take out Rey during the Episode 7 fight, but the alternate timeline doesn't go much farther than Rey ending up dead. That said, Movie Duels lets you play the duels featured in Dark Forces 2 and its expansion, which is great.

Movies Duels also gives you a new combat system based on parrying. I find this system to be a bit better than stock since actually getting hit by a lightsaber is very punishing, compared to stock where the other guy could still be going even if he's turned into molten mush. I advise pushing the damage from lightsabers up to max in the settings for best results.