Specifications

10 tools
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OSSFreePopular

Mermaid

Text-to-diagram natively supported by GitHub and Notion

⭐ 87,000
OSSFreePopular

Swagger / OpenAPI

The foundational OpenAPI toolchain for API design and docs

⭐ 28,700
FreePopular

Speakeasy

OpenAPI → idiomatic SDKs, MCP servers, and contract tests

FreePopular

Stainless

Generates hand-crafted SDKs trusted by OpenAI and Anthropic

OSSFree

OpenAPI Generator

Community-driven code generation for 50+ languages from OpenAPI

⭐ 26,000
OSSFree

Redocly

OpenAPI linting, bundling, and beautiful API docs from one CLI

⭐ 25,500
OSSFree

AsyncAPI

Open standard for defining event-driven async APIs

⭐ 5,100
OSSFree

Fern

OpenAPI in, idiomatic SDKs and API docs out

⭐ 3,000
Free

Eraser

AI co-pilot for technical diagrams synced to your codebase

Free

Stoplight

Visual API design platform with linting, mocking, and docs built in

Other categories

Coding Assistants (24)Autonomous Agents (11)Agent Frameworks (17)Pipelines & RAG (12)LLM Infrastructure (43)Design & UI (11)DevOps & CI/CD (6)Documentation (9)Product & PM (6)MCP Servers (15)Prompt & Eval (9)Spec-Driven Dev (3)AI Code Review (3)Fine-tuning (6)Voice AI (10)Multimodal (10)Browser Automation (7)Observability (14)Memory & Persistence (4)AI Guardrails (5)