The best replacement for screen sharing is remote management.

The best alternatives to screen sharing are rated as following:
★★★★★  remote management
★★★  apple remote desktop
★★★  remote login
★★  ard
★★  back to my mac
★★  remote desktop
★★  co-browsing

Your alternative for screen sharing is not listed? Suggest!
Speaking about screen sharing, one probably shouldn't forget about audio mac.

Other search terms related to screen sharing and their ratings are:
★★★★★ audio mac
You have in mind a companion for screen sharing and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of screen sharing in all years. Click on graph for more.
screen sharing
remote management
apple remote desktop