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Top 23 developer-tool Open-Source Projects
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ponytail
Makes your AI agent think like the laziest senior dev in the room. The best code is the code you never wrote.
Project mention: Claude Code Skills Worth Trying: From Vague Idea to Finished Feature | dev.to | 2026-09-14Ponytail for keeping implementations simple.
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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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Project mention: Report Generation: Asynchronous Jobs, Validation, and Load Latency Explained | dev.to | 2026-09-04
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Project mention: 300+ languages doesn't mean what you think: three tiers of code understanding | dev.to | 2026-08-08
I am not the first person to look at this. aider evaluated stack-graphs and went with tree-sitter tags plus PageRank instead (#534). So did OpenHands (#742) and SWE-agent (#38). Three serious teams reached the same conclusion: too much work, unmaintained upstream, not worth it.
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Project mention: API Testing Tools Worth Knowing in 2026 - Alternatives to Postman | dev.to | 2026-06-29
Hoppscotch: https://hoppscotch.io
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archify
Agent skill for beautiful, verifiable architecture, workflow, sequence, data-flow, and lifecycle diagrams—self-contained HTML with motion and crisp export.
Project mention: Stop dragging boxes in Draw.io: Turn plain text into interactive architecture maps | dev.to | 2026-10-06I recently found an open-source tool called Archify that takes a completely different approach.
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Project mention: Choosing the Best Cloud Infrastructure for AI Agents: A Comprehensive 2026 Guide | dev.to | 2026-10-05
Daytona offers a versatile ecosystem that defaults to containers but allows for VM and GPU upgrades. It is particularly strong for enterprise use cases requiring SSH access and robust SDK support across multiple languages.
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Full disclosure, since you're on Bruno's blog: this is where we tell you about Bruno. We'll keep it factual.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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Streamlit makes it easy to turn Python code into interactive web apps.
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Project mention: File Labs alternatives - Files and doublecmd | libhunt.com/r/file-labs | 2026-10-05
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codebase-memory-mcp
High-performance code intelligence MCP server. Indexes codebases into a persistent knowledge graph — average repo in milliseconds. 158 languages, sub-ms queries, 99% fewer tokens. Single static binary, zero dependencies.
Project mention: Google's Ax and Anthropic's Financial Services Are Trending — But Who Solves Long-Running Workflow Resilience? | dev.to | 2026-09-23DeusData/codebase-memory-mcp indexes codebases into a persistent knowledge graph. It solves the "context loss" problem in long-running agent tasks — agents don't have to re-read the entire codebase every time.
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Project mention: Yazi: Fast terminal file manager written in Rust, based on async I/O | news.ycombinator.com | 2026-09-20
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The same ask keeps resurfacing across frameworks (smolagents #901, Agno #2500, Letta #957), and the honest summary is: memory grows unbounded unless something prunes it, and real consolidation is hard. It's worth finding out what in your store ever takes a record back out of the retrievable set - an expiry, a state you can set, a pass that runs on its own - and whether that is the store doing it or you remembering to. I won't claim Engrava has solved forgetting - it hasn't.
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herdr is the terminal multiplexer on my laptops. Unlike tmux, it knows which pane is an agent and whether that agent is working, blocked, done or idle:
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appsmith
Platform to build admin panels, internal tools, and dashboards. Integrates with 25+ databases and any API.
Project mention: Two AI APIs die this weekend: Perplexity Sonar (Sep 27) and Appsmith AI (Sep 30) | dev.to | 2026-09-24Since release 2.3, you can no longer create new Appsmith AI datasources or new queries against existing ones. The API rejects both with a clear 400 (AE-DTS-4031). Existing datasources and queries keep working until September 30 and now show a non-dismissible deprecation banner with the date. Source: https://github.com/appsmithorg/appsmith/pull/42015
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IT-Tools, maybe? https://github.com/CorentinTh/it-tools
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agents
Multi-harness agentic plugin marketplace for Claude Code, Codex, Cursor, OpenCode, GitHub Copilot, Google Antigravity, and Pi
Project mention: Skills Sprawl: When Too Much of a Good Thing Confuses Your AI Agent | dev.to | 2026-08-17Specialised & Community Skills: Niche skills sourced from specific community repositories, including wshobson/agents (documentation-and-adrs, interview-me), coreyhaines31/marketingskills (seo-audit), remotion-dev/skills (remotion-best-practices), and vercel-labs/skills (find-skills).
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Whilst I agree that Bash makes it far too easy to do it wrong, it's not too tricky to write scripts that don't have those issues.
Possibly the most important tip is to use ShellCheck (https://www.shellcheck.net/) as a linter on your scripts and work through the various warnings to eliminate them. For the rare times that ShellCheck is overly cautious, you can remove a specific warning with a comment before the offending line such as
# shellcheck disable=SC1091 -
Project mention: Google no longer provides direct URLs in search results | news.ycombinator.com | 2026-09-11
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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)
There is already a popular project called httpie, so httpy would be really confusing in non written form. Beside that, i completely agree, the name could be better.
https://httpie.io/
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More: continue.dev
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Refine
A React Framework for building internal tools, admin panels, dashboards & B2B apps with unmatched flexibility.
portal-template-default is a 574-file React scaffold: React 19 with TypeScript, Vite, Refine as the data layer, Tailwind CSS 4, shadcn/ui (about 60 components), lucide, vitest, Playwright.
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Project mention: Show HN: Sunk Cost – How long until a local LLM rig pays for itself? | news.ycombinator.com | 2026-09-14
Regarding DeepSeek, which I also like very much, have you tried https://reasonix.io ?
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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).
developer-tools discussion
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Your sampleRate won't save you from an error flood. Here's what does
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The Model Changed. My Skill Didn't. The Score Still Dropped.
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Stop dragging boxes in Draw.io: Turn plain text into interactive architecture maps
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Introducing TAP: software building blocks for the agentic world
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Asked to undo a commit, 19 of 36 models destroyed work nobody mentioned
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A note from our sponsor - AppSignal
www.appsignal.com | 8 Oct 2026
Index
What are some of the best open-source developer-tool projects? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | ponytail | 155,167 |
| 2 | puppeteer | 95,649 |
| 3 | OpenHands | 89,838 |
| 4 | Hoppscotch | 80,561 |
| 5 | archify | 76,177 |
| 6 | daytona | 71,674 |
| 7 | bruno | 47,334 |
| 8 | streamlit | 45,871 |
| 9 | Files | 45,819 |
| 10 | codebase-memory-mcp | 45,671 |
| 11 | yazi | 42,680 |
| 12 | agno | 42,542 |
| 13 | herdr | 41,787 |
| 14 | appsmith | 41,006 |
| 15 | it-tools | 40,737 |
| 16 | agents | 40,180 |
| 17 | ShellCheck | 40,131 |
| 18 | devdocs | 39,514 |
| 19 | lapce | 38,887 |
| 20 | httpie | 38,500 |
| 21 | continue | 36,101 |
| 22 | Refine | 35,762 |
| 23 | DeepSeek-Reasonix | 35,729 |
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