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Best Open-Source Tools 2026: Self-Hosted SaaS

The open-source tier is the data-ownership counterweight to the SaaS market: the same jobs — passwords, analytics, scheduling, product analytics — with source you can audit, self-host, and never get lock-in fees from. We compared four leaders across four categories against their official pricing pages (verified 2026-09-01) on the axes that decide the pick: independent rating, license and self-hosting freedom, free-tier depth, and the cheapest paid plan. Bitwarden (4.3) is the class leader on rating: a free-for-life tier with unlimited passwords and devices, Premium at $19.80/yr. Plausible (4.2) is the privacy-first analytics pick — AGPL self-hosted edition free, or the cloud Starter at $9/mo for 10k pageviews. Cal.com (4.1) brings customizable scheduling with a free unlimited personal plan and Teams at $12/mo/user; note that since April 2026 its hosted core moved closed-source, with the reduced MIT edition continuing as Cal.diy. PostHog (4.0) covers product analytics end-to-end under MIT: self-host free, or the cloud free tier of 1M events/month. Where to start depends on the lock-in you are willing to keep. Bitwarden is the only pick whose free tier already covers real multi-device password and secrets work without a subscription, and its paid ladder (Premium $19.80/yr, Teams $4/user/mo) stays under half of commercial rivals at team level; self-hosting keeps the vault on your own hardware but means you run the updates and backups. Plausible is the clean choice when the hard requirement is privacy and cookie-free data: the AGPL self-hosted edition is free and the cloud entry is a flat $9/mo for 10k pageviews, so the bill only moves when you cross into Growth or Business. Cal.com needs the most careful read: the hosted core closed-source in April 2026, the reduced MIT edition continues as Cal.diy, and the paid Teams plan (from $15/user/mo billed annually) is where SSO, SCIM and compliance live; pick Cal.com for the polished product, Cal.diy if self-hosting the codebase is the point. PostHog is the breadth pick — one MIT-licensed stack covering events, feature flags and session replay — with 1M events/mo free and usage-based pricing after, no seat fees, so the cloud bill scales with volume, not headcount.

How we rated

Bitwarden

Best overall open-source tool
★★★★4.3

The open-source password manager (4.3, the class-top rating): free tier with unlimited passwords and devices, Premium at $19.80/yr — open source and the best value in one.

Free tier: Yes
Paid from: $19.80/yr (Premium; $19.80/yr ($1.65/mo); Families $47.88/yr; free tier = unlimited passwords & devices (re-checked 2026-09-09: Teams $4/user/mo and Enterprise $6/user/mo published — the open-source ladder stays under half of LastPass/1Password at team level; self-hosting on Enterprise))

Plausible

Best privacy-first analytics
★★★★4.2

The lightweight, cookieless web analytics (4.2): AGPL self-hosted edition free, cloud Starter at $9/mo for 10k pageviews — privacy-respecting by design.

Free tier: No — trial only · 30-day free trial
Paid from: $9/mo (Starter $9/mo (10k pageviews; $14 Growth 100k, $19 Business 1M); yearly = 10x monthly (2 months free); 30-day trial; free self-hosted edition (AGPL))

Cal.com

Best open scheduling
★★★★4.1

The customizable Calendly alternative (4.1): free individual plan with unlimited bookings, Teams at $12/mo/user billed annually ($15 monthly). Licensing note (April 2026): the hosted core is closed-source and the original repo is archived; the MIT community edition continues as Cal.diy (no teams, workflows or analytics).

Free tier: Yes
Paid from: $12/mo/user (Teams; billed annually ($15 monthly); individual plan free unlimited event types & calendars; Organizations $28/mo/user annual (SSO, SCIM, compliance))

PostHog

Best open-source product analytics
★★★★4.0

The open-source product suite (4.0): MIT license, self-host free, or cloud with free 1M events/month and usage-based pricing at $0.00005/event beyond — analytics plus session replay and feature flags.

Free tier: Yes
Paid from: Usage-based (Usage-based: 1M events/mo free, then $0.00005/event; no seat fees; free tier includes unlimited team members, 1 project, 1-year retention; MIT self-host)

Bottom line

Bottom line: Bitwarden is the 2026 overall pick: the class-top rating (4.3) with open-source licensing and a true free-for-life tier (unlimited passwords and devices), Premium at $19.80/yr. Plausible (4.2) is the pick for privacy-first web analytics — AGPL self-host free or $9/mo cloud for 10k pageviews. Cal.com (4.1) brings customizable scheduling with a free unlimited personal plan and Teams at $12/mo/user — since April 2026 its hosted core is closed-source, with the reduced MIT edition continuing as Cal.diy. PostHog (4.0) covers product analytics end-to-end under MIT, self-host free or free 1M events on the cloud. All four give you auditability and an exit from lock-in — the shared promise of the open-source tier.

FAQs

Which open-source tool is rated best in 2026?

Bitwarden leads at 4.3/5, ahead of Plausible at 4.2, Cal.com at 4.1 and PostHog at 4.0. All four are independently rated in the top half of their categories.

Can these open-source tools be self-hosted for free?

Partly: Bitwarden, Plausible (AGPL) and PostHog (MIT) all offer self-hostable editions free of license fees. Cal.com changed licensing in April 2026 — its hosted production core is now closed-source; the MIT community edition continues as Cal.diy in a reduced form (no team management, workflows or analytics).

Which open-source tool has the best free tier in 2026?

Bitwarden: free with unlimited passwords and devices. Cal.com: free individual plan with unlimited bookings. PostHog: free 1M events/month on the cloud. Plausible's free edition is self-hosted (AGPL); its cloud starts at $9/mo.