Best Developer Tools and Resources

Prepare a structured, traceable CRA Article 14 report under pressure, without starting from a blank page. Operational kit for SME manufacturers: fill-in 24h / 72h / final forms (PDF, DOCX, ODT), field guides, playbook. Not legal advice. Filling the forms is not compliance and is not a notification submitted to authorities. Not approved or endorsed by ENISA, the European Commission or ACN. Launch price EUR 29. English pack is EN-only.

HOL Guard is local-first runtime control for AI coding agents. It governs shell execution, secret-file reads, MCP server changes, and plugin/skill installs. Apache-2.0 open source by Hashgraph Online. Not a cloud MCP gateway.

Bit-level developer tools for hex, binary, decimal, and octal conversion with BigInt precision, plus register, float, and checksum utilities. Runs entirely in the browser.

uChecker is a bulk email checker for messy lists. Drop a .txt or .csv, one job can take up to 9 million addresses at about 3200 a minute. Results come back as Good, Bad and Risk. Anything that cannot be checked goes to Unknown, never counted as valid. The full mail-server reply is stored, so a deleted mailbox, a frozen account and an over-quota box stay three different outcomes. Dashboard app.uchecker.net, API api.uchecker.net/docs, Telegram @uchecker_bot, MCP uchecker.net/mcp.

An open-source framework that turns Claude Code into an autonomous company: a tick loop with role subagents, human approval gates on money and outreach, and an append-only ledger. No platform. Your keys, your repo.

SFT Studio Pro is a browser-based dataset workspace for supervised fine-tuning. Build projects, create golden examples, generate and audit batches, and export production-ready JSONL for SFT and LoRA workflows. Free tier plus paid dataset passes.

Clipy is a free online screen recorder for Mac, Chrome, and the web. Record your screen with audio, share an instant link, and avoid watermarks, viewer signup walls, and short free-tier recording caps.

Download Skool videos from classrooms, community posts, and course modules. Bulk Skool video download skoolHarbor is a Chrome extension for saving videos from Skool.com before access changes, cohorts close, or lessons get removed. It works across classroom lessons, community posts, about pages, and course modules, then downloads supported videos as standard MP4 files directly to your computer.

VeriWasp is an AI-powered playtesting tool for indie SaaS founders. Describe a user flow in plain English and it runs the test in a real browser using Claude. You get a video replay, console/network errors, and an accessibility scan, helping you catch broken flows before users do. No brittle test scripts required. It also offers a free accessibility scanner for quick website audits. Pay-per-use with cheap credits, designed for solo developers and small teams who ship fast.

Quick, private utilities for the everyday work that slows you down: images, PDFs, code, color and the math behind your money and health. Open one, get the job done, close the tab. No upload, no sign-up.

R2Suites is a platform that helps WordPress users integrate Cloudflare R2 for secure, cost-effective cloud storage. Our flagship product, Cloudflare R2 Storage Manager Pro, provides private bucket integration, secure file delivery, media management, and a free Lite mode with an optional Pro trial (no credit card required). Feedback is always welcome!

Nohmo is all-in-one product analytics for teams building on web and mobile. Most teams stitch together three expensive tools — a product-analytics platform, a mobile attribution provider, and a crash reporter — each with its own SDK and its own bill. Nohmo replaces all three with a single SDK that works across React, Next.js, plain HTML/Django, and React Native (iOS + Android). Drop in one line of code and Nohmo automatically captures everything

PulseCheck tells you the second your site goes down — before your customers do. Add a URL, pick an interval, choose where alerts land: email and/or Slack. Setup takes under a minute. We check as often as every minute, tracking response times, missing keywords, and expiring SSL certificates. Alerts stay readable: one message on a state change, then a nudge every 45 minutes — no 3am spam.

Generate synthetic US and multi-country address samples for form testing, prototypes, QA, seed data, and demos. AddressLab includes non-receiving .test email fields, local saves, and CSV or JSON export.

Free browser-based toolkit to convert, format, and validate JSON, YAML, and TOML. Processing stays on your device — no signup and no file uploads.

Prepare a structured, traceable CRA Article 14 report under pressure, without starting from a blank page. Operational kit for SME manufacturers: fill-in 24h / 72h / final forms (PDF, DOCX, ODT), field guides, playbook. Not legal advice. Filling the forms is not compliance and is not a notification submitted to authorities. Not approved or endorsed by ENISA. Launch price €29. English pack is EN-only.

SFT Studio Pro is a supervised fine-tuning dataset workspace for generating, reviewing, quality-checking, and exporting training corpora. It supports local JSONL workflows, OpenAI and DeepSeek formats, reasoning-model export templates, and free and paid tiers.

R2 Membership is a native Cloudflare R2 membership platform for WordPress. Organize content into Libraries and Collections, create flexible membership plans, sell access with WooCommerce, and protect downloads through CR2SM Pro with secure signed URLs. Built with an enterprise-grade architecture for performance, scalability, and seamless Cloudflare R2 integration. see less

ExtBid is a pay-to-rank leaderboard for Chrome extensions. Rank is the bid, not Web Store search or featuring. Listings link to the developer's Web Store page. Min bid $2, $1 increments, whole USD only, no refunds. Leaderboard Takeover: 2x the current #1 bid locks #1 for 3 hours. Rules: https://extbid.lol/rules