This is a collection of all custom, standalone Halo 2 campaign/firefight mods presently on the Steam Workshop (that I could find). I'll try and keep this collection updated semi-regularly.

NOTES:
➣ My definition of "custom, standalone campaign/firefight mods" is for mods that were created to be standalone experiences SEPARATE from the vanilla campaign. I have a separate collection for campaign overhauls (link below).
➣ This collection is not an endorsement of the content within it. This is supposed to be an archive of ALL available Halo 2 custom campaign and firefight missions, regardless of quality (exceptions below).
➣ Mods that are NOT included in the collection:
- Mods with only cosmetic changes (i.e. "Play As Your Own Spartan")
- Mods where the only change is god-mode
- Mods with no enemies/goal (i.e. Digsite missions which show off unused level exteriors)
- Mods that have no description/images
- Mods that have been broken for over a year and show no sign of being fixed (if an old mod doesn't work, let me know and I'll remove it)
➣ Mods are sorted based on star rating first, and then release date (newest > oldest). Ratings change so I'll try to update the order periodically.
➣ This collection includes English mods only.

My Halo mod collections:
➣ Halo CE: Campaign Overhauls
➣ Halo CE: Custom Campaign/Firefight
➣ Halo 2: Campaign Overhauls
➣ Halo 2: Custom Campaign/Firefight
➣ Halo 3: Campaign Overhauls
➣ Halo 3: Custom Campaign/Firefight
➣ Halo 3 ODST: Campaign Overhauls
➣ Halo 3 ODST: Custom Campaign/Firefight
➣ Halo Reach: Campaign Overhauls
➣ Halo Reach: Custom Campaign/Firefight
➣ Halo 4: Campaign Overhauls
➣ Halo 4: Custom Campaign/Firefight/Spartan Ops