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.
Heroku Redis - Reliable and powerful Redis as a service.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
Redis Cloud - Redis Cloud is a fully-managed cloud service for hosting and running Redis datasets.
Tcpdf - TCPDF: Open Source PHP Class for generating PDF documents
ngrok - ngrok enables secure introspectable tunnels to localhost webhook development tool and debugging tool.