PromptJuggler

Write and version AI prompts, chain them into workflows and agents, test them on datasets and run them through an API.

promptjuggler.com · Free plan

Running since2026Launch year from the maker

Details

What it does: Developer tools
Who it’s for: Developers, Software companies
Pricing: Free plan
Works on: Web, API
Tags: prompt engineering, llm workflows, ai agents, evaluations, prompt versioning

0sql
Model your data warehouse in YAML, then send business-term queries and get back one deterministic SQL statement.
Since 2026
Developer tools · Developers
agent-data
A catalogue of ready APIs for public websites, plus a builder to make your own, for AI agents and apps.
Since 2026
Free plan · Developer tools · Developers
Agent37
Cheap cloud sandboxes that host AI agent harnesses and background jobs for developers, billed by the minute.
Since 2025
Pay as you go · Developer tools · Developers
Agentcard
Lets teams building AI agents store user cards or issue cards so their agents can pay for things online.
Since 2026
Payments and checkout · Developers