/c/devtools

Connect any AI agent to 1,000+ apps via one MCP server.

AI agents that help you rank on Google and get cited by AI search.

Draw ASCII diagrams in the browser.

Encode and decode Base64 strings in the browser.

Generate and verify bcrypt password hashes in the browser.

js-beautify playground for JavaScript, HTML, and CSS.

SSH and Windows RDP workspace for server operations across desktop and Android.

IP subnet calculator for IPv4 networks and masks.

Browser support tables for web platform features.

Turn source code into a shareable image.

Custom software and mobile apps for Australian businesses

Minimalist JavaScript library for random / fake helpers.

Customer-facing changelogs and release notes for software teams

Unix file permission calculator: checkboxes to octal and symbolic chmod notation.

Chmod calculator and generator that explains Linux permission numbers.

Plain-language helper for picking an open-source license (MIT, Apache 2.0, GPL).

Interactive visual CIDR and IP range calculator.

Paste-only Claude Code surface audit — contradiction map + fix list in ≤48h. $79.

Track Claude Code reset windows and usage limits

CSS formatter / beautifier for readable stylesheets.

Simple WCAG colour contrast checker for design and UI pairs.

Quick browser CORS header / cross-origin test helper.

Plain-English explainer for cron schedule expressions.

Modular encoding/decoding pipelines that run in your browser.

Convert CSV ↔ JSON and related data formats in the browser.

Browser “Cyber Swiss Army Knife” for encoding, decoding, and data transforms.

Minimalist curl-friendly URL shortener and helpers.

Free browser diagram editor (draw.io) for flowcharts and architecture.

Global DNS propagation checker for A/AAAA/TXT/MX and more.

Instant SQL Formatter & Beautifier for many SQL dialects.

Free fake REST API with products, users, carts, and more.

Browser SHA-256 and related hash calculators.

Independent SMB endpoint security database — sourced prices, lab results, Fit Score

Open-source virtual whiteboard for hand-drawn diagrams.

Online fake JSON data generator with templates.

Free online SQL statement formatter for developers.

Free DIY car repair guides with steps and videos

JavaScript library to generate massive amounts of fake data.

Generate favicons from text, image, or emoji.

GitHub’s official collection of .gitignore templates for languages and frameworks.

Open-source font library with web font embedding.

Simple online GUID / UUID generator with bulk copy.

Sync and manage Google Drive workflows for sites and teams

Practical WordPress and WooCommerce plugins for stores

Policy checks on agent tools, before the command runs

Open-source plugin catalog securing AI agent tools for HOL Guard

Open-source API development and request playground.

Test .htaccess rewrite and redirect rules against a URL online.

HTTP request & response testing service for developers.

대한민국 공휴일·영업일 API와 MCP 서버.

Turn any photo into a textured printable 3D STL

Agent-native public product registry for indie software — search, llms.txt, queue-only submit.

Simple public IP address lookup API and web helper.

Open-source collection of client-side developer utilities.

Template-based online JSON fake data generator.

Visualize JSON as an interactive graph.

Format, validate, and convert JSON in the browser.

Validate and format JSON with clear lint errors.

Free online REST API for testing and prototyping with fake data.

JWT decoder / debugger — decode and inspect JSON Web Tokens in the browser.

Free ops and kit hub for small teams

Stuck? Some agent out there already figured it out.

Type English or Chinese meaning inside Obsidian math — get a full LaTeX template

Self-serve agent-job escrow and credits demo (money:false)

Live visitor maps, website traffic analytics and operator-initiated chat

Free Japanese-language memory estimates for local LLM quantization

Explainer and template for writing a good README file.

Generate MD5 hashes from text in the browser.

Write Mermaid diagrams as text and preview them live.

Preview Open Graph / Twitter card meta tags before you ship.

Realistic fake data generator for CSV, JSON, SQL, and Excel.

Chaos as a Service — one script tag, instant website delight.

Free in-browser Normal Map and PBR texture generator via WebGL2.

Korean open-source license information portal (Korea Copyright Commission).

Convert YAML to JSON in the browser (Online YAML Tools).

Open-source, local-first desktop AI workforce coordinated by a Commander through one chat.

Free in-browser PDF to Markdown converter. Nothing is uploaded.

Official Prettier playground — format JS, JSON, CSS, HTML, Markdown, and more.

Small practical WordPress diagnostics and offline utilities

Random data APIs and generators for names, phones, misc fake data.

Free API for generating random user profiles as fake data.

Drag-and-drop editor for writing a project README.md.

Regex tester with explanation, substitution, and unit tests.

Turn invoices and trade documents into typed JSON against your schema.

Badge service for README files: build, version, license, and custom badges.

Turn titles into URL-safe slugs instantly.

Check how a URL renders across common social share cards.

Canonical list of SPDX license identifiers and full license texts.

Online SQL formatter and beautifier for quick query cleanup.

Public SSL/TLS configuration grade for any HTTPS host.

Free tools for makers shipping products — clean copy, cost before scale, pick stack.

Browser OpenAPI / Swagger editor and preview.

Online table converter and generator for Markdown, CSV, Excel, JSON, SQL, and HTML.

Visual editor that generates Markdown, LaTeX, and HTML tables.

Collaborative project management for teams and AI agents

Test and validate robots.txt rules in the browser.

Classic free URL shortener with custom aliases.

Software licenses summarized in plain English (can, cannot, must).

Online CSS minifier and compressor with a simple API.

Generate .gitignore files by picking operating systems, IDEs, and languages.

Client-side converters between JSON, types, and other data formats.

Unminify / beautify JS, CSS, HTML, XML, and JSON in the browser.

URL-encode and URL-decode strings online.

Parse and look up browser user-agent strings.

Online UUID / GUID generator (v1 and v4).

Online UUID / GUID generator and decoder utilities.

WCAG color contrast checker for foreground and background pairs.

Instant unique URLs to inspect HTTP webhooks and requests.

Public WHOIS / domain registration lookup.

Free browser checklist for WooCommerce→Sheets webhook failures

Free offline checklist for broken WordPress enquiry paths

Control how AI sees your content.

Generate an XML sitemap for a public website.

Free online YAML validator and reformatter.

Private, on-device speech to text for AI assistants.