bwuxqdmgyeub / pdf-annotate

Edit PDFs in-browser: add text, highlights, stamps, freehand ink; fill forms, merge pages, export annotated PDFs.

umputun / remark42

comment engine

ArtalkJS / Artalk

🌌 Your Self-hosted Comment System. | 自托管评论系统

liveblocks / liveblocks

Realtime infrastructure for multiplayer apps and agents

LibrePaper / librepaper

A free collaborative writing, editing, and commenting platform