TinEye, SauceNAO, Search by Image, GazoPa, IQDB, Byo Image Search lab, THINK FR33 Reverse Image Search, Flow Powered by Amazon, Google Goggles, Image Analysis Toolset, NooBox, Picitup, Safe Design, isk-daemon, Plaghunter, Bingle Goggles are some alternatives to RevIMG.