H
HedgeDoc replaces 2 paid apps
One open-source tool, 2 subscriptions it can stand in for. Each pairing below is curated and verified by hand, with the honest catch spelled out. No votes, no pay-to-list.
EraserYESusage-based
Collaborative Markdown documents with Mermaid diagrams, revisions, and reveal.js presentations; no free-form whiteboard, but the engineering-doc job is real.
the verdict →all Eraser alternatives →
Slides.comYESusage-based
Write collaborative Markdown and present it through reveal.js, with diagrams, revisions, and exports; ideal when slides are text and code rather than decorative masonry.
the verdict →all Slides.com alternatives →last updated 2026-08-06 · no votes, no pay-to-list