The best replacement for sprockets is gears.

The best alternatives to sprockets are rated as following:
★★★★★  gears
★★★  requirejs
★★★  steel
★★  cogs
★  sunstar

Your alternative for sprockets is not listed? Suggest!
Speaking about sprockets, one probably shouldn't forget about changing chain.

Other search terms related to sprockets and their ratings are:
★★★★★ changing chain
★★★ rails
You have in mind a companion for sprockets and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of sprockets in all years. Click on graph for more.
sprockets
gears
requirejs