sdk

tldraw/tldraw

An infinite-canvas SDK for building custom React drawing apps — tldraw packages its whiteboard into a reusable React SDK with custom shapes, tools, bindings and a sync library for self-hosted real-time collaboration. It targets developers building canvas or diagram apps rather than a finished product, offering starter kits and a runtime Editor API for deep customization.

juspay/hyperswitch

A Rust-built payments switch that unifies dozens of providers — Hyperswitch is a PCI-compliant, open-source payments platform written in Rust, offering SaaS or self-hosted deployment. It connects to multiple payment, payout, fraud, vault and tokenization providers, and adds intelligent routing, reconciliation and cost observability to cut processing costs and ops overhead.

dream-num/univer

An embeddable office SDK built as a runtime for AI agents — Univer is an open-source SDK for embedding spreadsheet, document, and presentation editing into your own product, running the same architecture in browser or Node.js. It now frames itself as an 'Office Harness' where humans and AI agents share files via a plugin architecture, Canvas rendering, formula engine, and unified Facade API.

microsoft/agent-framework

Microsoft's multi-language framework for production AI agent workflows — Microsoft Agent Framework (MAF) unifies agent building and orchestration across Python, .NET and Go. It targets teams moving from prototypes to production, offering graph-based patterns (sequential, concurrent, handoff, group), durability, observability and human-in-the-loop control across Foundry, Azure OpenAI, OpenAI and Copilot SDK.

Unleash/unleash

Open-source feature flags with 30+ official and community SDKs — Unleash is an open-source feature management platform for rolling out features gradually, testing with real production data, and letting teams work in parallel without long-lived feature branches. It ships 15 official SDKs plus over 15 community SDKs, works with any language, and offers a free Enterprise trial alongside the OSS core.

openai/codex-security

OpenAI brings agentic scanning to app security workflows — A new CLI and TypeScript SDK from OpenAI that uses Codex to find, validate, and patch vulnerabilities. It supports deep repo scans, SARIF/JSON/CSV export, GitHub code scanning import, and CI automation, aimed at devsecops teams wanting agent-driven security reviews.

strands-agents/harness-sdk

An open-source SDK for building and controlling AI agent harnesses — Strands Agents' harness-sdk lets you build an agent harness in Python or TypeScript and control it end-to-end, model- and cloud-agnostic. It ships as separate Python/TypeScript harness packages plus a CLI, aimed at developers building production agents rather than quick demos.

solidjs/solid-start

SolidStart, the Solid app framework

templatical/sdk

Drag-and-drop email editor. JSON templates, MJML rendering, framework-agnostic. Vue + TipTap inside. Source-available under FSL-1.1-MIT — free commercially, MIT after 2 years.

gauge-sh/gauge-cli

A CLI that stress-tests how well coding agents use your product — Gauge runs real coding agents (Claude Code, Codex, Pi, OpenCode) against your Skills, CLI, SDK, MCP, or docs, capturing where they stumble, such as blocking prompts, stale commands, or unused Skills. It runs locally via Docker with no Gauge account needed, letting you validate fixes before publishing.

roicai/roicai-python

Official Python client for ROIC.AI's financial data API — This is the official Python SDK for ROIC.AI, covering fundamentals, earnings transcripts, SEC filings, stock prices, and forex. Responses are typed Pydantic models with automatic pagination and one-call conversion to pandas or polars DataFrames, making it convenient for quantitative analysts and finance app developers.