pdflayer - Free, powerful HTML to PDF API supporting both URL and raw HTML conversion. Unlimited document size, lightning-fast and compatible PHP, Python, Ruby, etc.
Mirro - An all-in-one team performance management solution made easy
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.
Tcpdf - TCPDF: Open Source PHP Class for generating PDF documents
Charte - Free online interactive charts for non-techies