This engine is the code behind "The game Creator's" FPS Creator development tool, A powerful, yet rough FPS engine.
If you're looking to start a career in game development, then the FPS Creator isn't a bad choice as a starting point. The map editor is basic and very easy to use. Add some grass here, place a few weapons and enemies there, it's all done with a few clicks depending on how big you want to level to be.
You can make your own single player games and multiplayer arena games. Some people have even made their own games and sold them online as well as high street shops. For example, you can look for Robert D. Anderson & The Legacy Of Cthulhu on shopping sites such as Amazon, eBay, etc. If you want to sell your games, you don't need to give The Game Creators any royalties or pay for licensing fees.
What really lets the FPS Creator down is the dated and buggy engine. The graphics look dull, the AI is bad (even though you can edit the AI scripts), your levels can glitch up when there are a lot of entities on the map and larger levels can cause performance issues.
As for content, there are a variety enemy types, weapons, objects and scenery based on which time period you're making your game in (World War II, Modern and future). You download more items for the FPS Creator from the Game Creator Store. Some of these items are free while others cost game creator points which can be bought online, or you can get these points for free by watching advertisements, answering surveys, downloading game clients, etc.
Overall, the FPS Creator isn't bad, but it does have its engine related issues which can put some people off. The asking price of £32 is worth it, considering that you don't have to pay for any licensing or royalty fees if you want to sell your games online.
As for the experts who know how to make maps and mods with other game engines (Source, Id Tech, Unreal Engine, etc), this package should be avoided.