Open-source, self-hosted team chat built for security and data sovereignty.
Free self-hosted Mattermost Entry edition for technical evaluation
$0 Visit Site →
Open-source tools
25 tools tagged “Open-source”, each reviewed against the same criteria: real pricing, verified features, honest pros and cons, and an editorial rating out of 5.
The open-source, Swiss privacy VPN with a genuinely unlimited free tier.
VPN Plus just $2.99/mo on the 2-year plan
Free; paid from $3.49/mo Visit Site →
The open-source password manager that's free forever and audited every year.
Free forever plan: unlimited passwords, unlimited devices
$0 Visit Site →
Swiss, open-source, end-to-end encrypted password manager with built-in email aliases.
Pass Plus 40% off: $2.99/mo on annual & 2-year plans
$0 (Free); Pass Plus from $2.99/mo Visit Site →
Open-source Firebase alternative: managed Postgres with auth, storage, and edge functions built in.
Pro/Team plans include $10/mo compute credits; spend caps on by default
$0 (Free) / $25 per month (Pro) Visit Site →
Fully managed LGTM observability stack — hosted Grafana, Prometheus, Loki and Tempo with a genuinely generous free tier.
Free forever tier — no credit card required
$0 (Pro from $19/mo + usage) Visit Site →
The world's default code editor — 100% free, monetized through GitHub Copilot
Editor 100% free; Copilot Free tier is also $0
$0 Visit Site →
Open-source CI/CD built into the GitLab DevSecOps platform
Self-host open-source CE free—unlimited CI/CD, no seat fees
$0 Visit Site →
The free, open-source automation server that still runs the world's CI/CD.
100% free & open source - no license cost, ever
$0 Visit Site →
Infrastructure as Code in the languages developers already know.
14-day money-back guarantee on paid Pulumi Cloud plans
$0 (open-source + free Individual tier) Visit Site →
The agentless automation standard: free open-source core, paid Red Hat platform for the enterprise.
Ansible Core: free, open-source, unlimited managed nodes
$0 (Ansible Core) Visit Site →
Free, open-source GitOps continuous delivery for Kubernetes
6 months free on Akuity for qualifying startups
$0 (free, open source) Visit Site →
Free, open-source MLOps toolkit for Kubernetes — pay only for your cluster
Free forever under Apache 2.0 — you only pay for infrastructure
$0 Visit Site →
The free, open-source container orchestrator that runs the cloud-native world
Free & open source - no license cost, ever
$0 (free, open source) Visit Site →
The container standard: free open-source engine, paid Desktop and Hub tiers for teams
Save ~18% on Docker Pro with annual billing ($9 vs $11)
$0 free; paid from $9/user/mo (Pro, annual) Visit Site →
Open-source multi-cluster Kubernetes management, with enterprise support via Rancher Prime.
Free open-source core; 30-day trial on managed AWS tier
$0 (open source) Visit Site →
Simplified, visual management for Docker and Kubernetes
Business Edition free forever for up to 3 nodes
Free Visit Site →
The free, open-source package manager for Kubernetes
Free and open source — no license or subscription cost
$0 Visit Site →
Free, certified lightweight Kubernetes in a single binary — built for edge, IoT, and CI/CD.
Free & open source — no license cost, ever
$0 Visit Site →
Free, no-fluff interview-prep guide that distills coding-interview strategy for busy engineers.
Free Visit Site →
Free, open-source terminal AI pair programmer that edits your code and commits to Git for you.
$0 Visit Site →
Open-source AI coding agent with bring-your-own-key, at-cost inference, and no vendor lock-in.
$0 (free tool; pay model inference) Visit Site →
Open-source, model-agnostic AI coding agent for the terminal, IDE and desktop — no vendor lock-in.
$0 Visit Site →
Open-source platform for building AI agents, RAG apps, and LLM workflows on a visual canvas or self-hosted.
Free (Sandbox tier and self-hosted Community Edition); paid cloud from $59/mo Visit Site →
Open-source visual builder for LLM apps and multi-agent workflows, with a cheap managed cloud.
Free / $35 per month Visit Site →