OpenApps
A directory of open source replacements for paid software, mapping over 680 projects onto 237 SaaS products. You can browse it by category (auth, analytics, DevOps, AI agents) or straight from the tool you want off your bill (Notion, Firebase, Vercel, Cursor). Every entry carries five project-health signals: development activity, maintenance, community, maturity, momentum. Browsing costs nothing; the operator sells stack audit engagements alongside it.
Strengths
- Indexed by the product you are replacing, so it works for someone who knows their bill and not the taxonomy
- Health signals shown per project, which keeps you off a repository abandoned two years ago
- Broad coverage, from application bricks to AI agents, with no account to create
Limitations
- No estimate of migration cost or lost features, so the part that actually decides stays on you
- The directory doubles as a sales channel for audit engagements, worth keeping in mind while reading
Best for
- Opening the candidate list before renegotiating or cancelling a subscription
- Finding the open source brick that fills the same slot as the SaaS you already run