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Bruno

Bruno Software · API development & tooling

Open-source, offline-first API client that stores collections as plain-text .bru files in a Git repository, with a CLI for running requests in CI

MITOpen sourceFreeLocalNov 2, 2026

Express

OpenJS Foundation · Web frameworks & UI

Minimal, unopinionated web framework for Node.js with routing and middleware, the long-standing default for HTTP servers in the Node ecosystem

MITOpen sourceFreeLocalSelf-hostedNov 2, 2026

Hoppscotch

Hoppscotch · API development & tooling

Open-source API client that runs in the browser or as a desktop app, supports REST, GraphQL and realtime protocols, and can be self-hosted for teams

MITOpen sourceFreeLocalSelf-hostedNov 2, 2026

Postman

Postman, Inc. · API development & tooling

Commercial API platform for designing, testing, documenting and monitoring HTTP and other APIs through a desktop and web client with cloud-synced workspaces

ProprietaryFreemiumPaidLocalNov 2, 2026

Pydantic

Pydantic Services Inc. · Data quality & validation

Python data-validation library using type hints to parse, validate and serialize models, with a Rust core; the schema layer behind FastAPI and many LLM SDKs

MITOpen sourceFreeLocalBroken

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