The best replacement for free online is tetris.

The best alternatives to free online are rated as following:
★★★★★  tetris
★★★★★  racing games
★★★★  shooting games
★★  battle games
★  hunting games
★  no deal game

Your alternative for free online is not listed? Suggest!
Speaking about free online, one probably shouldn't forget about downloading.

Other search terms related to free online and their ratings are:
★★★★★ downloading
You have in mind a companion for free online and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of free online in all years. Click on graph for more.
free online
tetris
racing games