Posting of skill plans and skill queue would be nice, then we can do nice things like analysis of various data sources and then update our queue to be more suitable and generate plans from such analysis.
This already exists, EVEMon - Character Monitoring and Planning for EVE Online.
There is no POST routes, so it’s impossible to exist.
Source: EVE Swagger Interface
I am a developer, I am looking for a POST route, not an application.