Signaturely - Super simple eSignature software
Free eSign Plan from PandaDoc - Legally-binding eSignatures 100% free with new PandaDoc plan
Woleet Sign - eSignatures secured by Bitcoin
GetAccept - GetAccept is a Sales tool for electronic signatures and sales document automation.
HTMLCSS to Image API - Convert HTML to an image (jpg, png, webp). Renders images exactly like Google Chrome. Works with PHP, JavaScript, Ruby, .NET and more.
DottedSign - The Best E-Signature Solution for Your Business