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Best free-to-use APIs you've ever came across?

OpenAPITools

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openapi-generator

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

hoppscotch

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hoppscotch

Open source API development ecosystem - https://hoppscotch.io (open-source alternative to Postman, Insomnia)

nasa

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openmct

A web based mission control framework.

getlago

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lago

Open Source Metering and Usage Based Billing API ⭐️ Consumption tracking, Subscription management, Pricing iterations, Payment orchestration & Revenue analytics

open-telemetry

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opentelemetry-demo

This repository contains the OpenTelemetry Astronomy Shop, a microservice-based distributed system intended to illustrate the implementation of OpenTelemetry in a near real-world environment.

juhaku

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utoipa

Simple, Fast, Code first and Compile time generated OpenAPI documentation for Rust