Common Mystery-Tools
| GC Wizard | https://gcwizard.net/# |
| NetteLeut(h)e – GC Tool | https://gc.de/gc/ |
| GC Toolbox | https://www.geocachingtoolbox.com/ |
| Mystery Toolbox | https://mysterytoolbox.organisingchaos.com/Home/About |
| Geocaching Multisolver | https://geocaching.dennistreysa.de/multisolver/ |
| GPS-Cache – Mystery Master | http://gps-cache.de/geocaching/ |
| DCode.fr | https://www.dcode.fr/en |
| Kryptografie.de | https://kryptografie.de/kryptografie/index.htm |
| Code Knacker | https://www.code-knacker.de/sitemap_ck.htm |
| Vignere Solver | https://guballa.de/vigenere-solver |
| Substitution Solver | https://guballa.de/substitution-solver |
| Cipher Identifier | https://www.cryptool.org/de/cto/ncid |
| Cryptii.com | https://cryptii.com/ |
| boxentriq.com | https://www.boxentriq.com/ |
| cachesleuth.com | https://www.cachesleuth.com/ |
| Piet Decoder | http://www.bertnase.de/npiet/npiet-execute.php/ |
| Punchcard Decoder | http://laighside.com/punchcard.htm |
Stegano-Tools
| Stegano Online Tool | https://stegonline.georgeom.net/upload |
| McAfee – Stegano Analyse Tool | https://www.mcafee.com/enterprise/de-de/downloads/free-tools/steganography.html |
| Steganografie Solver | https://www.bergziege-owl.de/steganografie-solver/ |
Image-Tools
| Magic Eye Viewer | http://magiceye.ecksdee.co.uk/ |
| Online Bild Vergleich | https://online-image-comparison.com/ |
| Gifsplitter Ezgif | https://ezgif.com/split |
| Image Decoder Tools | http://decrypt.imageonline.co/index-de.php |
| Photopea -Online Bild-Bearbeitung | https://www.photopea.com/ |
| Photo Forensics | https://29a.ch/photo-forensics/ |
| Photo-Kako | https://www.photo-kako.com/de/swirl/ |
Audio-Tools
| Morse Decoder (Audio) – Download | http://dxsoft.com/de/products/cwget/ |
| Audacity – Download | https://www.audacity.de/downloads/ |
| Software-Oszi – Download | https://asdfg.me/osci/ |
Mathe-Tools
| Online-Rechner – Wolframalpha | https://www.wolframalpha.com/ |
| Hex-/Binärzahl zu QR Code | https://bahamas10.github.io/binary-to-qrcode/ |
| UNIX Timestamp Tool | https://www.epochconverter.com/ |
| Matheseiten von Arndt Bruenner | https://www.arndt-bruenner.de/mathe/mathekurse.htm |
| Pi Nachkomma Tool | https://www.angio.net/pi/bigpi.cgi |
| Float Converter | https://www.h-schmidt.net/FloatConverter/IEEE754de.html |
| Zahleigenschaften | https://de.numberempire.com/1024 |
Science-Tools
| Sonnenverlauf Tool | https://www.sonnenverlauf.de/ |
| Schaltkreis Simulation | http://falstad.com/circuit/ |
| Chemie Tools | https://www.chemie.de/tools/ |
| Logic Simulation | https://logic.ly/demo/ |
Anagram-/Buchstabensalat-Tools
| Buchstabensalatlöser | https://www.wort-suchen.de/buchstabensalat-loesen/ |
| Anagram-Solver | https://www.kreuzwortraetsel.de/anagramm |
Browser extensions
| GC Little Helper | https://github.com/2Abendsegler/GClh/ |
| Mystery Wizard | https://www.saarfuchs.com/2021/08/mystery-wizard-bugfix-update-auf-version-3-2.html |
| Project GC | https://project-gc.com/Home/UserScript |
| send2cgeo | https://send2.cgeo.org/ |
| GCTour | https://www.gctour.de/ |
Other Caching Tools
| Koordinaten Umrechner | https://www.koordinaten-umrechner.de |
| LAB caches in GPX | https://gcutils.de/lab2gpx/ |
| Flopp’s tolle Karte | https://flopp.net/ |
| Cyber Chef | https://gchq.github.io/CyberChef/ |
| Steno Tool | https://steno.tu-clausthal.de/ |
| MiniZinc – Download | https://www.minizinc.org/ |
| Nonogramm Solver | https://www.bergziege-owl.de/nonogramme-loesen/ |
| Samurai Sudoku Solver | https://www.invik.xyz/samurai/ |
| cachesleuth Tools | https://www.cachesleuth.com/ |
| GC Tool Linkliste | https://hilftdirweiter.de/gc-tools-links/ |
| QR Code Tool | https://merricx.github.io/qrazybox/ |
| Wherigo-Tools | WiG-Crumbler (team-hildesheim.de) |
| Jigidi-Datenbank | Find coords for Jigidi caches (solvedjigidi.com) |