World's most comprehensive, powerful, process-based PDF editor
open source Java library for creating and editing PDF files
Open source PDF editor
A simple and elegant markdown editor
Web app for browsing, reading and downloading eBooks stored in Calibre
LilyPond sheet music text editor
ImageMagick 7
Image Toolbox is an powerful picture editor, which can crop
An open source and free music notation software
Pure go library for creating and processing Office Word documents
An extensible Markdown Editor, Viewer and Weblog Publisher for Windows
Collabora Online is a collaborative online office suite
A painless self-hosted Git service
PDF Processor, OCR, Imposition, Edit, Convert, Export, Secure & Sign.
A PDF Reader and Note-taker for OS X
Read, write and edit metadata
The iSphere Project for and RDi 9.5.1.3+
EasyABC is an open source ABC editor
Genealogy program
a library to create/modify PDF documents using HDC/TCanvas
A GNU/Linux operating system accessible for visually impaired.
LDraw™ editor for LEGO® style digital building instructions.