Internet Archive's open-source, web-scale, web crawler project
Open source enterprise search server for websites, files, and data
Elasticsearch File System Crawler (FS Crawler)
Automated mobile app crawler and testing tool built on Appium
Educational Python web scraping case collection for many sites
An open source search engine with RESTFul API and crawlers
Lightweight Java web crawler framework with jQuery-style extraction
a java-based crawler
Multiplayer dungeon crawler
Open source Search Engine and Enterprise Search