LocalTools
Privacy-first tools that work 100% on your machine.
What it does
Privacy-first toolbox for builders: LocalTools offers 40+ browser-based utilities — JSON/YAML/XML/TOML formatters, JWT debugger, PEM & PKI tools, HKDF/PBKDF2 playgrounds, AES-GCM, PDF merge/split, image optimizer, Markdown & regex studios, subnets, cron, QR — engineered so sensitive input stays client-side whenever possible instead of disappearing into black-box servers; free with no signup.
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DevTools SuiteMay 2026 · devtoolssuite.dev · ▲3Privacy-first dev tools run in browser. No login no tracking


More dev tools this month
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The first open-source price index for GPU compute Discussion | Link
Dev tools · 10d ago · producthunt.com

Open-source GTM skills for technical founders
Dev tools · 29d ago · gtmcofounder.com

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
Launched alongside, May 2026
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Parallel agents, diff reviewer, and multi-model comparisons
Dev tools · May 2026 · kilo.ai


- NW
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
Dev tools · May 2026 · github.com