I have reviewed the following sites
The good
- Krugle
- search[code]
- GrepCode (only Java)
The broken or unsuitable
(I’ll have to try these again later)
- Antepedia (GitHub login broken as of 2016-08-23; no code search?)
- SymbolHound (generic search engine, not just code)
- Codase (only C, C++, Java; service unavailable as of 2016-08-23)
- Codefetch (unreachable as of 2016-08-23)
The dead
Koders(discontinued)SymbolHound Code Search(discontinued)
When I originally did the review, Koders turned out to be the winner for my purposes, but I really liked the user interface and features of SymbolHound Code Search better. The only problem with SymbolHound was the small number of sites it has indexed. The search[code] engine was also promising at that time.
Many of the sites I’ve reviewed have since been discontinued completely or have disabled their code search functionality. Krugle and search[code] seem to be chugging along, and GrepCode is good if you live in the Java world.