1.NangoHQ / nango
Connect your agents & product to 1,000 APIs.
+5,856 stars
from 7,218 · score 8.68
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Ranked by Attention Score: stars gained over the last 180 complete days
7 repositories by Attention Score · May 7, 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
+2,191 stars
from 78,526 · score 7.69
3.Kong / insomnia
The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.
+2,059 stars
from 38,047 · score 7.63
4.scalar / scalar
Scalar is an open-source API platform: 🌐 Modern REST API Client 📖 Beautiful API References ✨ 1st-Class OpenAPI/Swagger Support
+1,555 stars
from 14,801 · score 7.35
5.stepci / stepci
Automated API Testing and Quality Assurance
+38 stars
from 1,835 · score 3.66
6.bottenderjs / messaging-apis
Messaging APIs for multi-platform
+9 stars
from 1,927 · score 2.30
7.zuplo / mockbin
Mockbin by Zuplo. Mock, Test, and View HTTP Requests and Responses
+9 stars
from 134 · score 2.30