[Kaperstone]

although there are alternatives to all of their features (offline play, music play, ad-free and more), that's all to keep them alive, but on the other hand, the price that is being asked is a freakin 10$, which is way too much for an ad-free view and a few poor features.
I'd support them if it was 1$ per month (who minds it ...), but with 10$ per month I can buy myself new games on Steam or something more worth it.