Algolia - Algolia's Search API makes it easy to deliver a great search experience in your apps & websites. Algolia Search provides hosted full-text, numerical, faceted and geolocalized search.
oTranscribe - A free web app to take the pain out of transcribing recorded media
Google Custom Search - Google Custom Search enables you to create a search engine for your website, your blog, or a collection of websites.
Listen N Write - Listen N Write can be used to play and transcribe ordinary audio and video recordings (WAV, MP3...
ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.
Sonix - Automatically convert audio & video to text in minutes