Is there a way to query OSM tags directly to build maps? For example, I do a bunch of mountain bike trail mapping, and due to judicious tagging I can pretty easily select all the assets I'd like in a map with a series of queries. Can I select ways using a query and have them become something I wish to call out?
http://overpass-turbo.eu/s/fly
(click 'Run' and then 'Export')
(I think there is a fair chance you are aware of it, posting for other readers too)
uMap mentioned elsewhere on this page has support for some formats output directly by Overpass API, which powers Overpass Turbo. Overpass Turbo has javascript for converting those formats to KML and GPX. So in uMap, you can generate a layer by pasting in the query, no need to push it through kml or gpx.