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Top 23 developer-tool Open-Source Projects
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After the upgrades, TypeScript started rejecting Buffer as a Response body. This wasn't a runtime issue — Puppeteer still returns a Buffer — but astro check (and therefore npm run build) flags it.
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Project mention: The $847/year Developer Tool Stack That Replaced My $4,200 SaaS Subscriptions | dev.to | 2026-03-24
Hoppscotch is open-source, runs in the browser, and does everything I used Postman for. Collections, environments, WebSocket testing — all there.
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OpenHands AGENTS.md
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Project mention: How Daytona Works: The Complete Guide to AI-Powered Development Environments | dev.to | 2026-05-31
GitHub: https://github.com/daytonaio/daytona
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Streamlit
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Project mention: Deep Dive: How Bruno 1.0 Stores API Tests Locally vs. Postman 11.0 Cloud Sync | dev.to | 2026-04-28
After 6 months of benchmarking, case study analysis, and real-world testing, our recommendation is clear: choose Bruno 1.0 if you are an engineering team that values performance, Git integration, and zero vendor lock-in. Our data shows Bruno outperforms Postman 11.0 in every local storage metric: 400ms faster startup for 1000+ test suites, 6x lower storage overhead per test, and zero sync latency. The case study above shows teams can save $2k+ per year in licensing costs and $18k+ per year in engineering time by switching to Bruno. For teams with heavy non-technical collaboration needs, or very small test suites (<100 tests), Postman 11.0’s free tier remains a viable option, but we recommend exporting collections to Bruno for all engineering use cases. The API testing landscape is shifting toward local-first tools to avoid cloud vendor lock-in, and Bruno 1.0 is leading that charge. Try Bruno today: download it from https://github.com/usebruno/bruno, and migrate your Postman collections in minutes using the native import tool.
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Project mention: My PC Cries Every Morning, But These 8 Startup Apps Are Worth It | dev.to | 2025-11-12
Files: File Explorer's Cooler, Younger Sibling
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Project mention: AI Agents: Mastering 3 Essential Patterns (Tool Using). Part 1 of 3 | dev.to | 2026-01-03
In this series of articles, we will explore three fundamental patterns in AI Agent development. We will use Python and the Agno framework, available on Github.
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appsmith
Platform to build admin panels, internal tools, and dashboards. Integrates with 25+ databases and any API.
AppSmith
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Project mention: 🚀 Lambda Deployments v2: Taking the Lambda deployment pipeline from MVP to production-ready | dev.to | 2026-03-16
I added ShellCheck to the CI pipeline. It catches common shell scripting mistakes like unquoted variables, unused variables, and POSIX compliance issues. It runs on every push against all scripts in the scripts/ directory.
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For that specific use case you could also try `yazi`[0], which is a TUI file browser that has image (and other filetypes) preview built in.
[0] https://github.com/sxyazi/yazi
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DevDocs (open source, free) is a local offline documentation viewer. There is a hosted version that can be used offline in a web browser.
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httpie
🥧 HTTPie CLI — modern, user-friendly command-line HTTP client for the API era. JSON support, colors, sessions, downloads, plugins & more. (by httpie)
httpie is easier to read than curl when testing APIs manually.
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Refine
A React Framework for building internal tools, admin panels, dashboards & B2B apps with unmatched flexibility.
Project mention: Open Source Retool Alternative: A Code-First, AI-Native Approach | dev.to | 2026-04-28Refine: github.com/refinedev/refine
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GPT-Pilot is an open-source autonomous AI agent framework powered by GPT.
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Tabby (by TabbyML) is a self-hosted AI coding assistant built in Rust, licensed under Apache 2.0, and available at github.com/TabbyML/tabby with around 33,000 GitHub stars as of mid-2026. The latest stable release is v0.32.0 (January 25, 2026), which added Mistral Embedding API support, generic OAuth, and multi-branch repository indexing.
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Project mention: Why We Stopped Using vLLM 0.6 for Local LLMs in Favor of Ollama 0.5 for Code Tasks | dev.to | 2026-04-28
The Continue VS Code extension (https://github.com/continuedev/continue) has native support for Ollama 0.5, enabling seamless code completion and chat directly in your IDE without any cloud dependencies. To set up Continue with Ollama, install the Continue extension from the VS Code marketplace, then add the following configuration to your VS Code settings.json file. This will configure Continue to use your local Ollama instance for code completion, with the custom codellama-custom model we created earlier. Unlike cloud-based LLM extensions, this setup has zero latency from network requests, no data privacy concerns (all processing happens locally), and works offline once models are pulled. Our team saw a 30% increase in developer productivity after switching to local Ollama + Continue, as developers no longer had to wait for cloud API responses or worry about proprietary code being sent to third-party servers. Continue also supports chat-based code generation, where you can ask the local Ollama model to explain a function, write tests, or refactor code, all without leaving VS Code. This integration took 5 minutes to set up per developer, and eliminated our team’s reliance on cloud-based code LLM tools entirely.
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Project mention: SurrealMX: In-memory storage with time travel and persistent storage | dev.to | 2026-03-26
SurrealMX is SurrealDB's in-memory storage engine that was built from the ground up a bit over a year ago. It was merged into the core database during the 3.0 alpha period last November with no fanfare at all in order to try it out for the first time as SurrealDB's in-memory storage engine. Since SurrealDB uses in-memory storage by default, that means that SurrealMX has been every 3.x user's default storage option since then.
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Project mention: Preact vs Astro 4: The Performance Battle benchmark in High-Scale | dev.to | 2026-05-07
High-scale performance gains are only valid if you test with realistic workloads that match your production traffic. Too many teams benchmark with 10 components on a fast WiFi network, then wonder why their app crashes under 1M DAU. Use the benchmark script we provided earlier to test with 10k+ components, throttled networks (3G, 4G, slow WiFi), and realistic concurrency (100+ req/s). Test both client-side and server-side metrics: TTI, FCP, LCP for client metrics; p99 latency, requests per second, memory usage for server metrics. For Astro apps, benchmark both SSG and SSR modes: SSG will always be faster for static content, but SSR is necessary for personalized content (e.g., logged-in user dashboards). Use Lighthouse CI to automate performance regression testing in your CI pipeline: set thresholds for LCP (<2.5s), FCP (<1.8s), and TTI (<3.8s) and fail builds that exceed them. In our case study, the e-commerce team caught a 400ms TTI regression before deploying by adding Lighthouse CI to their GitHub Actions pipeline, saving hours of debugging post-deployment. For cost benchmarking, use the AWS Pricing Calculator or Vercel’s cost estimator to project server costs for your traffic levels, as Astro’s lower resource usage can lead to significant savings at scale.
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composio
Composio powers 1000+ toolkits, tool search, context management, authentication, and a sandboxed workbench to help you build AI agents that turn intent into action.
Project mention: pass@1 is a gamble — how ensemble coding enhances AI reliability | dev.to | 2026-04-02The ensemble idea is in the air. Mozilla AI's Star Chamber fans out code reviews to Claude, GPT, and Gemini in parallel, using consensus tiers and optional debate rounds where anonymized feedback circulates back to all models. Karpathy's llm-council runs a deliberation pipeline — parallel query, peer review, chairman synthesis — for general-purpose tasks. Roundtable orchestrates multiple AI CLI tools through a unified MCP interface. Composio's Agent Orchestrator manages parallel coding agents with git worktrees for task decomposition — different agents working on different sub-tasks. And Aider's Architect Mode pairs two models in complementary roles (planner + editor).
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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Show HN: Lowfat – pluggable CLI filter that saved 91.8% of my LLM tokens
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I tested whether a code health score actually predicts bugs. Here's the benchmark
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Accguard – authorization regression testing for APIs
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Show HN: Aura, an LLM coding harness that dogfooded itself
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A note from our sponsor - SaaSHub
www.saashub.com | 7 Jun 2026
Index
What are some of the best open-source developer-tool projects? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | puppeteer | 94,449 |
| 2 | Hoppscotch | 79,438 |
| 3 | OpenHands | 75,905 |
| 4 | daytona | 72,497 |
| 5 | streamlit | 44,819 |
| 6 | bruno | 44,710 |
| 7 | Files | 43,798 |
| 8 | agno | 40,537 |
| 9 | appsmith | 39,980 |
| 10 | ShellCheck | 39,538 |
| 11 | it-tools | 39,125 |
| 12 | yazi | 39,035 |
| 13 | devdocs | 39,023 |
| 14 | lapce | 38,622 |
| 15 | httpie | 37,683 |
| 16 | Refine | 34,820 |
| 17 | gpt-pilot | 33,749 |
| 18 | tabby | 33,564 |
| 19 | continue | 33,552 |
| 20 | surrealdb | 32,337 |
| 21 | DevToys | 31,597 |
| 22 | lighthouse ci action | 30,320 |
| 23 | composio | 28,600 |
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