Backend & Cloud

Blazing typo-tolerant search with sensible defaults — up and running in minutes.

Product analytics + replay + experiments without per-event pricing shocks.

Public status pages included free with monitoring.

Enterprise-grade SSO, OIDC/SAML, social logins — run unlimited users for free.

No fully-free option yet — cheaper escapes on the detail page.

Functions from Docker images on any VM or k8s cluster.

S3-API-compatible object store on your own disks.

Federated SQL engine querying object storage without per-byte bills.

Automate real Chromium/Firefox/WebKit browsers in CI for free.

Sentry-compatible error tracking you can self-host trivially.

Community fork of Drone: simple container-native pipelines you host.

Framework-first auth library exploding in popularity — zero vendor.

Blazing on-the-fly image resizing/transformation behind your CDN.

Run the actual event-streaming standard on commodity VMs.

Zero-knowledge vault with free sync everywhere.

Per-second metrics with zero config — install and instantly see everything.

No fully-free option yet — cheaper escapes on the detail page.

Daemonless, Docker-compatible container manager with a polished GUI.

Self-hosted registry with scanning, signing and replication.

OTel-native APM: traces, metrics, logs in one UI you own.

The Apache-licensed fork purpose-built for search workloads.

Clean cookieless analytics — self-host removes pageview caps.

Postgres-based Firebase alternative: auth, DB, storage, realtime, edge fns.

Open-source AI code assistant for VS Code/JetBrains — use free local models or your own API keys.

Community-driven Gitea fork powering Codeberg; lightweight self-hosting.

Terminal UI for git that veterans refuse to leave.

Mini-Heroku powered by git push to your own box — the closest drop-in.

Session replay, heatmaps, funnels and flags in one self-hostable platform.

Wiring-the-flow automation beloved for smart homes and IoT.

CNCF container registry with scanning, signing and replication.

High-performance gateway with plugins, admin API and dashboard.

Zero-knowledge password manager with free tier and self-hostable server.

Open-source feature-flag platform with SDKs for every major stack.

Self-hosted session replay with devtools-grade state inspection.

Full mail-delivery platform (sending + receiving) you host.

Node-based automations with code freedom; self-host without seat fees.

The open-source fork of Mapbox GL JS — same maps feel, zero per-load fees.

Self-hostable BI without per-seat licenses.

Product analytics + funnels + session replay + feature flags in one platform you can host.

MongoDB-wire-compatible proxy backed by plain Postgres.

Serve any VPS with automatic HTTPS via a tiny reverse proxy config.

The metrics + dashboards stack half the internet runs on.

Expose local services through your own domain, free.

Battle-tested SSO with OIDC/SAML, social login and user federation.

Send push notifications to any device over simple HTTP PUT.

Flags + A/B testing with a stats engine, self-hostable.

Escalation chains, on-call schedules and Slack alerts, open source.

Self-hosted metasearch that aggregates Google/Bing/DDG privately.

Gorgeous self-hosted uptime monitoring with status pages, alerts, and 90+ notification channels.

Distributed Postgres-compatible SQL you can run yourself.

Lightweight, fast API development ecosystem that runs in the browser.

Drop-in Pusher-protocol-compatible WebSocket server.

Versioned docs sites with search and i18n, deploy free on CF Pages.

Linux-Foundation Redis fork — same protocol, no license anxiety.

Drag-and-drop internal tool builder over any DB/API.

Full mail-delivery platform — send from your own servers for pennies.

Drop-in Sentry-compatible error tracking — same SDKs, no event quotas.

Columnar OLAP that often outperforms warehouses at 1/10th the bill.

All-in-one scanner for containers, filesystems, repos and licenses.

Same engine, free self-hosted for most languages.

AWS-forked Elasticsearch + Dashboards: log search at Splunk scale, free.

Same Postgres + Auth + Storage + Realtime stack, on your own server with no per-project fee.

Question-your-data BI anyone on the team can actually use.

The open-source Terraform fork — drop-in, MPL licensed, community-run.

No fully-free option yet — cheaper escapes on the detail page.

The Linux Foundation Redis fork — same protocol, real OSS license.

Gorgeous self-hosted uptime monitor with status pages.

MIT-licensed Zapier alternative with 200+ piece integrations and AI steps.