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Free Developer Tools for Web Projects — Curated Toolkit

Small utilities that save a lookup: format converters, image optimizers, browser compatibility tables and product APIs you can call in an afternoon.

Each entry lists what it does, what it costs and whether a free tier is enough for a side project.

9 resources · last reviewed 2026-10-01 · curated by re • sources editors

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priceAllFree5Freemium4
licenseAllFree to use4Open source2Proprietary3
typeAllCollection2Open source2Generator3SaaS2
platformAllWeb9API2Self-hosted1iOS1Android1Figma1
tagAllprivacy3api2compatibility1browser support1standards1reference1image1webp1avif1compression1conversion1pdf1
Squoosh preview
Free
pick

Squoosh

Browser-based image compression to modern formats.

Apache 2.0imagewebp
Cal.com preview
Freemium

Cal.com

Open-source scheduling infrastructure for teams.

AGPL-3.0, paid cloud tierschedulingself-hosted

Frequently asked questions

Do these tools require an account?

Most of the single-purpose utilities work without registration. The APIs and form builders listed here do require a free account before you can use them in production.

Can I self-host any of these?

The open-source entries are marked as such in the license column and can be self-hosted. The rest are hosted services with their own terms.