CosmosDev

What it does

CosmosDev is a growing collection of free developer tools built for speed, simplicity, and productivity. It includes utilities like JSON Formatter, JWT Decoder, Base64 Encoder/Decoder, QR Generator, UUID Generator, Password Generator, and more. Built as a solo developer project with a focus on clean UI, fast performance, and an easy developer experience.

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  TryDevUtilsFeb 2026 · ▲4

  Essential collection of developer utilities

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  ViteTools.devNov 2025 · ▲10

  Free online developer tools & utilities

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  Dev UtilitiesMay 2026 · github.com · ▲3

  Free online developer tools — 60+ utilities.

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  AniqDevJul 2026 · dev-tools-hub--w56305341.replit.app · ▲5

  Free, privacy-first developer tools — no login, no clutter

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  ToolSphere.devMar 2026 · toolsphere.dev · ▲2

  ToolSphere – 100+ Free Developer Tools in One Place

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  NinjadevMay 2026 · ninjadev.app · ▲2

  All-in-one platform for smart, secure, and fun dev tools

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  Dograh▲592

  The open source VAPI alternative

  Dev tools · 26d ago · dograh.com

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  Meridian▲530

  Don't let your work go unnoticed. Get promoted!

  Dev tools · 21d ago · meridiona.com

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  x1▲516

  Lovable for iPhone apps go from idea to App Store

  Dev tools · 12d ago · x1.new

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  Open-Source eInk Bike Computer▲408

  OpenTrailPaper is open-source bike computer firmware for the LilyGO T5S3 4.7" E-Paper PRO. It supports offline maps, GPX routes, FIT recording and Bluetooth sensors.

  Dev tools · 2d ago · opentrailpaper.com

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  The GTM Co-Founder▲402

  Open-source GTM skills for technical founders

  Dev tools · 30d ago · gtmcofounder.com

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  Nuphos▲380

  The AI-Native DevOps Workspace.

  Dev tools · 25d ago · nuphos.ai

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  Brew ▲905

  Like Claude design for email marketing

  AI · May 2026 · brew.new

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  Kilo Code for VS Code▲897

  Parallel agents, diff reviewer, and multi-model comparisons

  Dev tools · May 2026 · kilo.ai

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  StoreClaw▲805

  Grow your store profits with agents that know how to sell

  AI · May 2026 · storeclaw.ai

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  PollyReach▲796

  Give your agent a real number and voice to make calls.

  AI · May 2026 · pollyreach.ai

• NW
  Needle: We Distilled Gemini Tool Calling into a 26M Model▲776

  Hey HN, Henry here from Cactus. We open-sourced Needle, a 26M parameter function-calling (tool use) model. It runs at 6000 tok/s prefill and 1200 tok/s decode on consumer devices. We were always frustrated by the little effort made towards building agentic models that run on budget phones, so we conducted investigations that led to an observation: agentic experiences are built upon tool calling, and massive models are overkill for it. Tool calling is fundamentally retrieval-and-assembly (match query to tool name, extract argument values, emit JSON), not reasoning. Cross-attention…

  Life & fun · May 2026 · github.com

• FM
  Files.md – Open-source alternative to Obsidian▲730

  Dev tools · May 2026 · github.com