SG-1 Missions is a singleplayer modification of the older known Stargate TC multiplayer mod, it delivers hard 11 missions that take place in the Stargate universe. Unfortunately, the mod itself in its current version is problematic and would often crash, it also came with a 3rd party software to launch maps that quite frankly was broken. Remod is both a gameplay and HD modification for SG1M that attempts to repair the crashes of the original, remove the off-putting mission manager thus allowing players to simply select any mission they wish to play, change some of the difficult/unfair/confusing gameplay, and improves the visual look to look just a bit better.
The trailer for SG-1 Missions Remod, it shows some of the changes to visual though not so on the gameplay part, still, it should suffice as something to show.