Open Audio Search is a search engine for audio. It uses automated speech recognition to turn spoken word into text, which is then indexed in a full-text search engine. The engine can subscribe to RSS feeds to ingest content from different sources. Through a web user interface, users can search in the generated transcripts of radio shows and podcasts and play them right from the time mark of a search result. Open Audio Search is open source, developed as a collaborative project and can be easily installed on any server.