Since Steam updated their library view in the client, so you can use most of the functions directly in official software, I don't see a need to work on this tool anymore. There are also better tools out there to manage your library on multiple different platforms, like Playnite.
Nevetherless, you can still use this tool as you like.
This tool helps players to look through their Steam libraries. Steam client still lacks many library-concerned features. That's why this tool was built.
Have access to statistics of your Steam account and achievement hunting. It includes also Steam ranks from steamladder.com
Chosing a game from your library you are able to see and filter your achievements, see the inventory, playing statistics (provided by steamdb.info). It also comes with useful links to game page on Steam store, game inventory (steamcardexchange.net), and beating time (howlongtobeat.com). You can also launch a game from your browser.
Found a bug? Have a suggestion? Just want to write "thanks"?
Steam Library Filter Tool was created by Krylan.
You can visit my portfolio to check other works or get in touch.