There are not many titles in the software section on Steam just yet, but it will probably increase over time. There are some graphic and benchmark applications like 3D-Coat, GameMaker: Studio, 3Dmark Vantage etc. If Valve continues its usual process of accepting new software like they do with games, it will certainly become filled with new titles very soon. From the apps they have so far it's possible that they won’t have cheap, single purpose apps, but free apps will be supported nevertheless. They will be listed under new releases along with games, but if you want to see them clearly you can check only applications under the “software” tab.

Steam has a 5 million daily active user base and the software industry could surely benefit from this collaboration. Some of the currently available software is integrated into Steamworks, for example 3D Coat allows users to create 3D models and port them directly into Team Fortress 2. Also GameMaker: Studio allows game creators to upload their game to Steam and get feedback from other gamers that will help a lot with free games, especially in case when you're lost in the internet searching for the latest update of the game you want to play. Until the end of the week all products from the “software” category are discounted 10% so be sure to grab what you need before the discount wears off.

Discuss this in our Forum