Thanks to all.
Looks like Thea Render could be a good solution to start. Here are some other solutions for Keyshot PRO poor fans:
1. The best of and better than Keyshot: Maxwell Render Studio + HDR Light Studio. Total price is like Keyshot PRO but this solution has a lot of better features than Keyshot PRO.
2. Arion Studio + HDR Light Studio. Total price is less than Keyshot PRO, but has less features and materials library is not so developed.
3. Zbrush + Keyshot plug-in with Keyshot Bridge. Total price is less than Keyshot PRO, but it works completely as Keyshot PRO, exept import feature. So you can import only through Zbrush and work only with Zbrush-supported formats. OBJ format is ok, so it could be good for someone.