OneTab - Shared tabs

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Geocaching Toolbox

What's in your digital caching bag? A collaborative list of online TOTT : geocaching

index - geocaching

GeocachingToolbox.com. All geocaching tools a geocacher needs in one box.

dCode's Tools List (Crypto Tools, Math & Game Solvers) Online

MIJN_CODEBOEK_DEEL_3.pdf

Number conversions

Numbermatics - the Number Explorer

Integers.co | Detailed Information on Integers Numbers

The Engineering ToolBox

EXIF Data Viewer

FREE Numbers Conversion Table

3-point resection using Tienstra's Method

Enigma Simulation in Javascript/HTML

Forensically, free online photo forensics tools - 29a.ch

Image Steganography

They Live Steganography - Decode Image

quipqiup - cryptoquip and cryptogram solver

The Black Chamber - Substitution Cracking Tool

teal nonogram solver

Ciphers

Omniglot - the encyclopedia of writing systems and languages