Code Search
- Google Code Search
- http://www.google.com/codesearch
- Koders - Source Code Search Engine
- http://koders.com/
- Krugle
- http://www.krugle.com/
- The CPAN Search Site - search.cpan.org
- http://search.cpan.org/
- perl日本語ドキュメント全文検索
- http://www.cpan.jp/search.cgi