Useful

A massive, community-maintained list of SaaS, PaaS, and IaaS offerings with free tiers for developers — hosting, databases, CI/CD, monitoring, and far more.

An online editor and social playground for front-end code. Spin up an HTML, CSS, and JavaScript sketch in seconds and share it instantly.

A full-featured, in-browser Markdown editor with live preview, syntax highlighting, and cloud sync. Handy for drafting docs and posts anywhere.

An interactive, visual playground for mastering Git. Work through branching, merging, and rebasing with animated feedback on every command.

A quick reference for the Git aliases and shortcuts that ship with the Oh My Zsh plugin — a real time-saver at the terminal.

A handy reference gist summarizing the code smells and refactoring techniques from Martin Fowler’s Refactoring (2nd Edition).

A searchable catalog of code katas to sharpen your problem-solving, design, and test-driven development skills through deliberate practice.

Alex Hyett makes the case for code katas as deliberate practice and explains how to use them to grow as a developer.

Generate free SSL/TLS certificates so you can secure sites and APIs with HTTPS without paying for a commercial certificate.

Drop-in enterprise authentication for B2B apps — SSO, SCIM directory provisioning, and social login without building it all yourself.

Lucid’s visual collaboration suite (Lucidchart and Lucidspark) for diagramming, system design, and whiteboarding with a team.

A visual workspace for flowcharts, wireframes, mind maps, and process diagrams, with real-time collaboration.

Image and video upload, transformation, optimization, and CDN delivery via a simple API — offload media handling from your app.

A live streaming and video production studio for the Mac. Great for polished screencasts, demos, and webinars.

Schedule, publish, and analyze social media posts across platforms from a single dashboard.

Automate data exports and reporting by syncing data from your apps into spreadsheets, BI tools, and warehouses.

A managed vector database for similarity search and retrieval-augmented generation (RAG) at scale.

High-quality embedding and reranking models for semantic search and retrieval-augmented generation.