Is my cache on Crown Land?
Check the Nova Scotia Crown Land interactive map
Do my caches need maintenance?
To search for your caches with DNFs or other issues, go to this link at project-gc. Log in with your geocaching ID, and then select your username under "Profile name".
The geocaching website also has a cache owner dashboard.
Puzzle tools:
General purpose:
Geocaching Toolbox: https://www.geocachingtoolbox.com/
CacheSleuth: https://www.cachesleuth.com/ (wide variety of tools; their "helpful links" page points to over 70 other geocaching sites including many puzzle tools)
GC Wizard: https://gcwizard.net/ and https://blog.gcwizard.net/ (lots of tools; can be used offline on Andriod or iOS)
Geocaching Mystery Toolbox: https://mysterytoolbox.organisingchaos.com/
Codes and Ciphers:
DCODE: https://www.dcode.fr/en , including columnar transposition cipher
Cipher tools at rumkin.com
Text Manipulator at rumkin.com
https://quipqiup.com/ (automatic cryptogram solver)
http://altamatic.com/crypt (another automatic cryptography solver)
Geocaching puzzle help facebook group (closed) https://www.facebook.com/groups/geocachingpuzzlehelp/ . The group includes an extensive list of helpful sites (too long to list here).
Images:
http://fotoforensics.com/ (analyse images)
There are many online tools to view metadata hidden in images. Just look for "exif viewer". There's one at https://exif.tools/
https://incoherency.co.uk/image-steganography/ (online tool to hide images inside the lower "bits" of other images, or extract them)
https://pinetools.com/c-images/ (various image manipulation tools including edge detection and edge enhancement)
https://ezgif.com/maker (can split an animated gif into frames)
http://magiceye.ecksdee.co.uk/ (Magic Eye viewer)
https://tineye.com/ (reverse image search)
Google search by image: https://www.google.com/imghp?hl=en
Image diff (look for differences in near-identical images): https://www.diffchecker.com/image-compare/
(Links to steganography are under development).
https://www.wolframalpha.com/ (online mathematical tool)
https://www.jsingler.de/apps/logikloeser/index.php?language=en (logic puzzle solving tool)
Coordinates and maps:
Free GPS maps for Garmin: http://garmin.openstreetmap.nl/
GPS converter: http://boulter.com/gps/ (at http://boulter.com/geocaching/ )
GPS visualizer: http://www.gpsvisualizer.com/
OpenStreetMap: https://www.openstreetmap.org
Databases, lists, finding and organizing caches, cachers, etc:
Geocaching Swiss Army Knife (GSAK): https://gsak.net/
Project-GC: https://project-gc.com/
Trip planning / safety:
AdventureSmart Trip Planning tool from https://www.adventuresmart.ca/ . App available from Apple App Store, Google Play, or online at URL.
Log sheets: