Deepgram - Search engine for speech
Tesseract - Tesseract is an optical character recognition engine for various operating systems
Hidden Markov Model Toolkit - Hidden Markov Model Toolkit (HTK) is a portable toolkit used for speech recognition research, speech synthesis, character recognition and DNA sequencing.
GOCR - GOCR homepage. GOCR is an OCR (Optical Character Recognition) program, developed under the GNU Public License.
Jasper - Jasper is an open source platform for developing always-on, voice-controlled applications.
TextGrabber - Office & Productivity