Redemption is a total conversion for Half-Life 2 currently being developed by Steve Montgomery (AKA FlashJackson). It is designed to be an expansion story for the story within Half-Life and Half-Life 2.
Redemption is the story of a scientist named Paul who is captured by the soldiers about the time they start looking for Dr. Gordon Freeman in Half-Life. He is recruited (well forced actually) to infiltrate Sector E, where a group of scientists are protected by a security system that has already taken out two special forces teams. His job is to infiltrate Sector E and turn off the security system.
Through some very interesting plot twists, Paul ends up stuck in Sector E for 12 years. When he wakes up, the world has changed, and now he must support a revolution in someplace called City 17.
The game will feature maps in both Black Mesa Research Facility and City 17. It will focus on creating a good pace of creative problem solving and intense combat. New weapons and enemies will be introduced throughout the game. A few old ones will be re-introduced, like the Gluon Gun and Tau Cannon. Also, appearances from Kleiner, G-Man, Barney, and Alyx will mark key points in the game.
Visit the website for more details.
Right now, this mod is being worked on 100% by Steve Montgomery. The goal is to release the mod in chapters (or episodes) that can be completed in a reasonable time frame. Steve is maintaining a blog on the website as well as a tutorial section to share information he learns throughout the process.