I recently came across a useful online resource, RoaringApps.com. The premise is simple: a catalog of Mac and iOS applications, and their respective compatibility with different versions of OS X and iOS. While it is not a complete, or exhaustive list, it does cover a decent number of the most popular applications.
Two useful tips when using the site – the list is automatically filtered by letter, so you only see apps starting with ‘A’ at first (over 400!). Next, you can elect to filter those apps per platform, and per condition – that is, works with some problems, doesn’t work at all, or works fine – to help narrow your search down.