Reaper is a reasonably priced fully featured DAW for sound mixing but still not very well known in sound post circles, probably because it has no OMF/AAF import. It is much better known within music production.
Not sure if people know about this project conversion tool below but could be pretty useful to some people here. There is also a free version for download if people just want to see how well it works.
How to convert FCP X projects into Reaper projects for sound post.