Kroki : Convert plain text diagrams to images !
Kroki provides a unified API with support for BlockDiag (BlockDiag, SeqDiag, ActDiag, NwDiag), C4 (with PlantU...
Prince : Convert your HTML documents to PDF.
Beautiful printing with simple CSS.
Prince is an ideal printing component for server-based software, such as web a...
imgproxy : imgproxy is a fast and secure standalone server for resizing and converting remote images. The main principles of imgproxy are simplicity, speed, and ...
Open Paperless : Scan, index, and archive all of your paper documents. Open Paperless is a re-think of the user interface and user experience for Mayan EDMS. The goal ...
CouchDB : Apache CouchDB™ is a database
that uses JSON for documents,
JavaScript for MapReduce indexes,
and regular HTTP for its API
If you need to convert files from one markup format into another, pandoc is your swiss-army knife.