Number 1:
Craft Quantities
Free JSON API for construction calculators with test vectors and building codes
- Developer Tools
- DR not measured yet
Parts bin · 111 builds
Tools built by makers for other makers: the bench-side kit that helps solo builders write, test, ship and run their own code.
Open sponsor spot. $19 for 7 days puts your company at the top of Developer Tools, labelled Sponsored. See how it works. It never moves a vote.
Free JSON API for construction calculators with test vectors and building codes
Device and IP intelligence APIs for developers
Check a Framer site at eight widths for layout, accessibility, SEO, links and speed before you submit or hand it over, with the fix for each problem.
Free Australian tax API and MCP server for AI agents
The code cockpit for AI coding agent sessions
Webhook monitoring, retries and replay
A smoke alarm for your AI-built app
Free online webhook URL, CLI, SDK and MCP server for testing webhooks and email
Compare files, folders and archives side by side on Windows
An epistemic state engine that tracks what each character knows, and how they learned it
Dynamic QR code generator with Swiss hosting
Book metadata database and API for searching, converting and using ISBN data
Lightweight A/B testing platform for fast-moving teams
AI-ready test management tool for manual and automated testing in one system
An open standard for portable grounding for AI that packages knowledge with its structure and original sources
Access Google Search, Shopping, Maps, News, Images, Videos, Autocomplete and AI Mode through a single API key, with results in JSON, Markdown or HTML format and
Command-line tool to manage your shop on the eno.vn marketplace from a terminal, script or AI agent
Read-only SQL over Australian electricity and gas market data for organisations serving many clients from their own software and AI agents
Batch processing simplified, at the lowest cost
Decision API for typed questions with probabilities
WhatsApp API gateway for developers
REST API for live data from Instagram and Facebook profiles, media, and social graph
AI coding agent integration for mobile game research
Independent weekly benchmarks for infrastructure providers
Community votes come from makers and cannot be bought. DR is Domain Rating by Ahrefs.
Makers paid to hang these on the wall. Biggest total goes first. Community votes are never sold and live on their own board.
Every maker ends up building a tool to fix their own annoyance. This is the shelf where those tools land. Developer Tools collects the products that help you write, test, deploy and keep software running, made by solo builders and small teams who use the thing themselves before they ask anyone else to.
Browse the whole category or step into a subcategory, from APIs and SDKs, testing, DevOps and databases through to editors, error tracking, form backends, starter kits, scraping, documentation and webhooks. Open source projects now have their own category, Open Source. Each page lists the products in that subcategory, and the main category shows everything underneath it, with filters to narrow the pile. New launches sit at the top by default. Switch to community votes if you want to see what other builders rate. Votes can never be bought, so the order reflects what people actually picked up and tried.
Building something in Developer Tools? List your product here.