Tesseract - Tesseract is an optical character recognition engine for various operating systems
Nanonets OCR - Intelligent text extraction using OCR and deep learning
GOCR - GOCR homepage. GOCR is an OCR (Optical Character Recognition) program, developed under the GNU Public License.
Base64.ai - Extract text, data, photos and more from all types of docs
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
Nanonets - Worlds best image recognition, object detection and OCR APIs. NanoNets’ platform makes it straightforward and fast to create highly accurate Deep Learning models.