Anyway, I never could find a definitive list of all these. I can't imagine anyone collecting them all, but they really are worth the price tag! Please let me know which ones I have missed in the comments!
1. Indiana Jones
Indiana Jones is of course the famous explorer, archaeologist, and professor that about everyone knows of. Currently, Dark Horse has two volumes of Indiana Jones Omnibuses, and three Indiana Jones: Further Adventures Omnibuses.- Indiana Jones Omnibus Volume 1
- Indiana Jones Omnibus Volume 2
- Indiana Jones: Further Adventures Omnibus Volume 1
- Indiana Jones: Further Adventures Omnibus Volume 2
- Indiana Jones: Further Adventures Omnibus Volume 3
2. Star Wars
Alright, so there are about 1005 of these Star Wars Omnibuses, so hold tight. (Deep breath).
- X-Wing: Rogue Squadron Volume 1
- X-Wing: Rogue Squadron Volume 2
- X-Wing Rogue Squadron Volume 3
- Tales of the Jedi Volume 1
- Tales of the Jedi Volume 2
- Droids
- Early Victories
- Rise of the Sith
- A Long Time Ago... Volume 1
- A Long Time Ago... Volume 2
- A Long Time Ago... Volume 3
- A Long Time Ago... Volume 4
- A Long Time Ago... Volume 5
- At War With the Empire Volume 1
- At War With the Empire Volume 2
- The Complete Saga: Episodes I though VI
- The Other Sons of Tatooine
- Droids and Ewoks
- Clone Wars Volume 1: The Republic Goes to War
- Clone Wars Volume 2: The Enemy On All Sides
- Clone Wars Volume 3: The Republic Falls
- Infinities
Okay, so not quite 1005, but that's a lot! I personally can't vouch for any of these, but it's Star Wars, and there has to be a reason they have made so many, right?
3. Aliens
Here we have one of my personal favorites. From the classic science-fiction film Alien, comes these wonderful books. Some are based loosely around characters from the movies, but many are original stories in the same universe. Honestly, I've enjoyed the story in all these more than I have in any Alien movie.