The best replacement for conky is rainmeter.

The best alternatives to conky are rated as following:
★★★★★  rainmeter
★★★★★  gkrellm
★★★★  screenlets
★★★  i3status
★★  torsmo
★★  dzen
★★  htop

Your alternative for conky is not listed? Suggest!
Speaking about conky, one probably shouldn't forget about awesome.

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



Google Trends

Scale is based on the average worldwide traffic of conky in all years. Click on graph for more.
conky
rainmeter
gkrellm