1.NangoHQ / nango
Connect your agents & product to 1,000 APIs.
+596 stars
from 12,478 · score 6.39
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5 repositories by Attention Score · Oct 4, 2026 – Nov 2, 2026 (UTC)
2.hoppscotch / hoppscotch
Open-Source API Development Ecosystem • https://hoppscotch.io • Offline, On-Prem & Cloud • Web, Desktop & CLI • Open-Source Alternative to Postman, Insomnia
+248 stars
from 80,469 · score 5.52
3.scalar / scalar
Scalar is an open-source API platform: 🌐 Modern REST API Client 📖 Beautiful API References ✨ 1st-Class OpenAPI/Swagger Support
+165 stars
from 16,191 · score 5.11
4.Kong / insomnia
The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.
+123 stars
from 39,983 · score 4.82
5.stepci / stepci
Automated API Testing and Quality Assurance
+6 stars
from 1,867 · score 1.95