Wayfinding tools and apps
+MotS index 

Wikipedia related
Nearbywiki MacOS Website shows a map of wikipedia entries, with excerpts. 

  • iOS app by kanasys.com quits 
  • iOS Nearby quits
  • WikiGO iOS in app charges. Auto location. £0.99 for more locations. Pins give summary £1.99 for complete article. Filter by Popular, Well Known, Interesting.  For £2.99 step by step navigation to nearby places
  • AroundThis - free. Displays nearby list and map.
  • Inquire - map with listing in the same pane. Recently update of app
  • Wikipedia app shows only a limited set of articles
  • Wikiexplorer may be available for Android
Queries
Excerpts don’t match full articles - e.g. Hand and Shears

Locate and log different sort of hidden caches.  Geocaching apps available.

Waymarkly
iOS app shows waymarks drawn from various sources. Partner with way marking.com 

Waymarking.com will provide you with the tools to share and discover unique and interesting locations on the planet.

US-based. This website is an illustrated searchable online catalog of historical information viewed through the filter of roadside and other permanent outdoor markers, monuments, and plaques. 

Similar approach to Nearbywiki

Lists/thumbnails of Wikipedia articles available from clicking coordinates of an article, and then going to Wikipedia articles on the resulting GeoHack page

The aim of this website is to document all the memorials in London. That's the plaques, monuments, statues, fountains, etc, that commemorate a person, an event, a building, etc. 

Take part in preset hunts or create your own.

Earlier forms of wayfinding
Signs of Old London - in Spitalfields Life

WikiHow

Legible London