A couple more new sites have popped up trying to fill the CapGeek void...
http://capfriendly.com -- I like that you can toggle between cap hit, salary, bonuses, and clauses all on the main page. It's lacking individual player details. The free agent search is well done.
https://www.hockeyscap.com -- So far, this one seems to have most of the stuff we were used to on CapGeek, like the Armchair GM and Buyout Calculator.
One thing I miss from CapGeek that I haven't found on any of the other sites is the team depth chart.