API Infrastructure Open Source Tools

Alternative toAtScale

Headless BI platform with a shared semantic layer for your data

• 21,046 GitHub stars

Alternative toDocuSign

Open source document signing and fillable PDF forms

• 18,756 GitHub stars
• AGPL-3.0Licence AGPL-3.0

Alternative toX (formerly Twitter) Premium

Own your account and move freely across compatible servers

• 18,349 GitHub stars
• MITLicence MIT

Alternative toInfluxDB Cloud

Ingest high-frequency data and query it in real time with SQL

• 17,454 GitHub stars
• Apache-2.0Licence Apache-2.0
• #Database

Alternative toKong Konnect

Cloud-native API gateway with dynamic routing and plugins

• 17,243 GitHub stars
• Apache-2.0Licence Apache-2.0

Alternative toAmazon DynamoDB

Distributed key-value store with ACID transactions at scale

• 16,918 GitHub stars
• Apache-2.0Licence Apache-2.0
• #Database

Alternative toLlamaParse

Document parsing and ETL for LLMs, RAG pipelines, and AI agents.

• 15,583 GitHub stars
• Apache-2.0Licence Apache-2.0
• #LLM

Alternative toAuth0

Open source identity platform with SSO, RBAC, and multi-tenancy

• 15,354 GitHub stars
• AGPL-3.0Licence AGPL-3.0

Alternative toTwilio

Real-time voice and video infrastructure on open source WebRTC

• 14,862 GitHub stars
• Apache-2.0Licence Apache-2.0
• #AI Agents

Alternative toAuth0

Multi-tenant auth platform with SSO, RBAC, and social login

• 14,731 GitHub stars
• MPL-2.0Licence MPL-2.0