Good list, several new to me. Windy looks fantastic. Another resource I have come to really appreciate and use often is CalTopo. Great mapping, both desktop and app, with very nice planning, much easier routing than Gaia, and some really useful overlay options (including Sentinel satellite imagery, weather, etc.), and of course tons of trail data. Interface not quite as “pretty” as Gaia, takes some getting used to, but worth checking out for sure.
And of course, there the sites like Alltrails (and here in the PNW, WTA.org) that are great resources for reading trip reports and getting insights from recent hikers about trail conditions.

