Van Buren (aka Fallout 3)
Van Buren was the project name Black Isle Studios assigned to their version of Fallout 3. In 2003, the game was canceled and the Black Isle employees were laid off.The game was going to use an engine that Black Isle had made for Baldur's Gate 3, commonly referred to as the Jefferson Engine. It was fully 3D. Black Isle Studios planned to include a dual combat system in the game that allowed for the player to choose real time or turn-based combat, due to Interplay's demands, though Joshua Sawyer had stated that the emphasis would be on the turn-based version. Co-operative multiplayer was also going to be included in the game, again because of publisher requirements.
Fallout (PlayStation)
A proposed top down shooter proposed for Sony's original PlayStation console, although a prototype existed it was cancelled after 3-4 months of development. A Fallout top-down shooter for the original PlayStation was in development at Interplay at one point. It was canceled after about 3–4 months of pre-production and early prototyping. The PlayStation port of another notable cRPG published by Interplay,Baldur's Gate, was similarly canceled, although in a near complete state.

Fallout Tactics 2
Canceled sequel to Fallout Tactics: Brotherhood of Steel. developed by Micro Forté. Pre-production started shortly before the release of the first game, but it was canceled around December 2001. After the game started selling rather poorly, the sequel was canned by Interplay and didn't even get past concept. This would see the Midwestern Brotherhood of steel head South-East, towards Florida to deal with a GECK causing mutations. This game was cancelled in pre-development due to poor sales of the previous title.Fallout: Brotherhood of Steel 2

also known as Vagrant Lands, was the canceled sequel to Fallout: Brotherhood of Steel. The development started before the release of the first game, and it was almost complete when Interplay laid off most of their employees in 2004. The plot incorporated some elements from Van Buren, the canceledFallout 3 by Black Isle Studios (Caesar's Legion, the Jackals, Nursery), as well as the mutated G.E.C.K. from the canceled Fallout Tactics 2. In March 2009, the design document for the game, written by Brian Freyermuth (one of the designers of the original Fallout), was leaked.
Fallout Online (aka "Project V13")
Following the sale of the Fallout franchise to Bethesda, Interplay retained a limited right to develop an online Fallout game. This ended up resulting in a lawsuit between the two companies, and the idea to make a MMO based Fallout remains unrealised.Initially, Project V13 was the internal code name for Fallout Online. In addition to the current team Jason Anderson, one of the other makers of Fallout, was involved in the project between 2007 and 2009, but had since left the team. Interplay's rights to developing and publishing this game have been the subject of a legal dispute between Bethesda Softworks, the current owner of the Fallout franchise, and Interplay.Fallout Extreme
Another Sequel for Fallout Tactics, but developed for Consoles. This game would have seen "The Cause" head Northwest, through Canada and on to Alaska to do battle with the Brotherhood of Steel; following this victory they would then head on to China to destroy a Doom's Day Missile. Fallout Extreme is a canceled, squad-based, first- and third-person tactical game for the Xbox and PlayStation 2, using the Unreal Engine and developed by Interplay's 14 Degrees East division. It was in development for several months in 2000, but never had a concrete development team and had not been developed past conception. The game was never officially announced, and its existence was virtually unknown until detailed information about it was released in January 2010.