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Top 23 SDK Open-Source Projects
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tldraw
Build infinite canvas apps in React with the tldraw SDK. World's best, top-most agent recommended #1 five star SDK.
Project mention: quickdraw VS tldraw - a user suggested alternative | libhunt.com/r/nmndwivedi/quickdraw | 2026-07-31tldraw ships under a custom license with a paid business tier (and a watermark you pay to remove). Quickdraw is MIT - free commercially forever, watermark off with watermark: false - with zero runtime deps, a ~46 kB core, and React / React Native / plain-JS packages in one project. Pick Quickdraw if you want a complete-but-lean free whiteboard you can embed and fork without legal friction.
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AppSignal
Monitoring that respects your time & budget. APM, error tracking, and dashboards for modern web apps. Ten-minute setup, transparent flat pricing, and support from engineers who actually use the product.
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hyperswitch
Open source, composable payments platform | PCI compliant | SaaS and Self-host options | Enables connectivity to multiple payment, payout, fraud, vault and tokenization providers | Uplifts authorization with intelligent routing and revenue recovery | Reduce payment processing costs with cost observability | Reduces payment ops with reconciliation
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Project mention: LLM Is Not a PDF Parser: Use OpenDataLoader First | news.ycombinator.com | 2026-08-12
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Projects that involve AI integration increasingly shape everyday development. One such project is Semantic Kernel. It's an SDK for building AI agents and orchestrating LLM scenarios, and Microsoft actively develops it.
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openapi-generator
OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)
To be fair I've never used Laravel - but I do have a memory of code generators/scaffolders inserting files that made clear they were responsible for work
/*
* NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
* Do not edit the class manually.
*/
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univer
Univer is a full-stack framework for creating and editing spreadsheets / word processor / presentation on both web and server.
Project mention: Show HN: SheetMog – OSS Excel alternative and headless SDK | news.ycombinator.com | 2026-06-04Love it!
With HTML being the future, xslx embedding is the way to go.
Can you speak about how you are different from Univer [1] please?
Link 1: https://github.com/dream-num/univer
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Kargo
Stop Scripting Promotions. Start Shipping with Kargo. Kargo automates promotion across dev, staging, and prod with approval gates and verification. Open source, built by the team behind Argo CD. Download now.
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agent-framework
A framework for building, orchestrating and deploying AI agents and multi-agent workflows with support for Python and .NET.
Project mention: Agent memory you can 'git blame' and how OKF4net grew into a zero-dependency .NET toolkit | dev.to | 2026-09-04'OKF4net.Agents' turns a bundle into tools and context for the Microsoft Agent Framework. 'OkfBundleTools' exposes read, browse, graph, search, write, append-log, validate and more as function tools an agent can call directly. Layer 'OkfContextProvider' onto the same instance and the agent automatically gets relevant bundle context injected into each turn — and, when you opt in, its exchanges captured back into the bundle as long-term memory:
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Building dart sdk on Github issues
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adk-go
An open-source, code-first Go toolkit for building, evaluating, and deploying sophisticated AI agents with flexibility and control.
Project mention: Go LLM SDK for streaming, tool-calling AI back ends plus front end | news.ycombinator.com | 2026-07-30ADK seems like a better thought through SDK family, I use Go, Py is most mature, also TS and Java. The docs still need a lot of work to cover all the languages, it's pretty hit or miss right now, but one can also have a coding agent look at the source and an example for another language.
https://adk.dev/get-started/about/ | https://github.com/google/adk-go
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Project mention: One tool call, counted twice: a Google GenAI streaming double-dip in Sentry's JS SDK | dev.to | 2026-08-14
The change is open as getsentry/sentry-javascript#23432.
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rocketride-server
High-performance AI pipeline engine with a C++ core and 50+ Python-extensible nodes. Build, debug, and scale LLM workflows with 13+ model providers, 8+ vector databases, and agent orchestration, all from your IDE. Includes VS Code extension, TypeScript/Python SDKs, and Docker deployment.
Concretely, provider choice is a configuration field. The OpenAI-compatible node takes base_url and model as config properties, so pointing a pipeline at Together, Groq, a vLLM deployment, LM Studio or an Ollama instance means changing two fields rather than writing a new code path. The branded presets in the repository are the same implementation with the base URL pinned. That is the portability claim, and it is small enough to verify in the source in about a minute, which is the point of stating it that narrowly.
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GenieX
Run frontier LLMs and VLMs locally on Qualcomm devices across NPU, GPU, and CPU with a few lines of code
Project mention: Qualcomm acquires Nexa AI, open-sources GenAI runtime for Hexagon NPUs | news.ycombinator.com | 2026-07-07 -
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qiskit
Qiskit is an open-source SDK for working with quantum computers at the level of extended quantum circuits, operators, and primitives.
Issue: https://github.com/Qiskit/qiskit/issues/16594 Fixed in Qiskit 2.5.1, PR #16599. The fuzzer: https://github.com/cleitonaugusto/CleitonForge
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operator-sdk
SDK for building Kubernetes applications. Provides high level APIs, useful abstractions, and project scaffolding.
Project mention: Kubernetes: what are the Kubernetes Operator and CustomResourceDefinition | dev.to | 2025-09-16There is also the Operator SDK, which allows you to work with controllers even with Helm, without code.
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harness-sdk
Build an agent harness and control it end-to-end. Open-source SDK for production AI agents in Python & TypeScript - any model, any cloud.
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Project mention: eridu-tech alternatives - AdonisJs Framework, Nest, trpc, orpc, and Next.js | libhunt.com/r/eridu-tech-core | 2026-08-07
SolidStart vs a framework‑agnostic backend. SolidStart: - Excels at client rendering, SSR, routing, and a rich frontend ecosystem. - Ships its own server‑side APIs, API routes, and server functions. - Often the best starting point for shipping a web app quickly. - Backend logic locked into SolidStart. - No built‑in, batteries-included backend infrastructure. eridu-tech: - Not a web or frontend framework — not a replacement for SolidStart. - Complements SolidStart — API routes and server functions can use cache, locks, queues, and schedulers. - Same backend logic moves between SolidStart and a standalone API service or worker. - Add eridu‑tech for portable, testable server‑side infra.
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
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A note from our sponsor - SaaSHub
www.saashub.com | 13 Sep 2026
Index
What are some of the best open-source SDK projects? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | tldraw | 50,332 |
| 2 | hyperswitch | 43,595 |
| 3 | opendataloader-pdf | 29,085 |
| 4 | semantic-kernel | 28,553 |
| 5 | openapi-generator | 26,738 |
| 6 | univer | 14,347 |
| 7 | unleash | 13,798 |
| 8 | agent-framework | 13,485 |
| 9 | plasmo | 13,147 |
| 10 | SFML | 12,014 |
| 11 | sdk | 11,278 |
| 12 | librealsense | 9,011 |
| 13 | adk-go | 8,764 |
| 14 | sentry-javascript | 8,744 |
| 15 | rocketride-server | 8,431 |
| 16 | GenieX | 8,360 |
| 17 | octokit.js | 7,842 |
| 18 | qiskit | 7,790 |
| 19 | operator-sdk | 7,678 |
| 20 | harness-sdk | 7,200 |
| 21 | Firebase | 6,658 |
| 22 | openvr | 6,650 |
| 23 | solid-start | 5,921 |
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