Here's the National Weather Service API, for those in the US: https://api.weather.gov
Here's the National Weather Service API, for those in the US: https://api.weather.gov
Not an API, but I really like supercell wx for a local radar terminal. Cross platform and works great on Linux. It does require an API key to do the map rendering, but the actual weather data is pulled from government sources (free)
I know it used to be possible to get these same images -- but with the actual radar imagery separated from the base map, didn't have time to find those, but I'd guess they're still around somewhere.
Edit: a bunch of different radar-imagery only layers from each station over a longer time period: https://mrms.ncep.noaa.gov/RIDGEII/L3/
I've never understood what benefit any other app could provide given they are just ingesting the BOM data.