HelpStack - Open Source mobile help framework to support iOS and Android app users.
Tesseract - Tesseract is an optical character recognition engine for various operating systems
Helpshift - Helpshift is an in-game customer support platform that enables mobile apps to improve customer experience, drive higher ratings and increase retention.
Onlineocr.net - Free Online OCR service allows you to convert PDF document to MS Word file, scanned images to editable text formats and extract text from JPEG/TIFF/BMP files
KeyReply - Omnichannel keyboard for mobile teams to respond better and faster.
ABBYY FineReader - ABBYY's latest PDF editor software, FineReader 16 you can easily convert files like PDF to Excel, PDF to Word, edit, share, collaborate & more with this PDF editor!