Computer Games
Tools focused around various computer games

Rust Tool Cupboard Calculator

Developer Tools
Online tools to help developers

WordPress Admin Login Generator

Mime Type Database

Fun On-Line Tools
Online tools for various fun exercises, probably never actually useful - but who knows!

Text To Numbers (beghilos)

Snick - Style Nickname

Mail Tools

Email Signature Generator

Online Conversion / Transformation Tools
Online tools for converting / transforming various data.

PHP UNIX Timestamp Converter

PHP Session Decoder

PHP Unserialize Online

URL Encoder / Decoder

Base64 Decoder & Encoder

Embed Image into HTML or CSS

Image Aspect Ratio / Resizing Calculator

Optimized YouTube Embed Code Generator

QR Code Generator Online

YouTube Thumbnail Enhancer

Security Focused On-Line Tools
Online tools focused around security and best security practices.

Password Generator

SEO Tools
On-line tools related to SEO.

HTTP / HTTPS Header Check

HTML Visualizer

Keyword Extractor / Density Checker

Bulk Redirect Chain Checker - 301 / 302

Embed Image into HTML or CSS

Online CSS Tidy + Outdated CSS Remover

Favicon & PWA Generator

Domain DNS Lookup

Bulk SSL Validator Online

Sitemap & Sitemap Index Checker