The skills section of Capsuleers.app is a navigable catalogue of EVE Online skills, grouped by official ESI category: Spaceship Command, Gunnery, Missiles, Drones, Engineering, Electronic Systems, Targeting, Navigation, Shields, Armor, Rigging, Resource Processing, Production, Science, Trade, Social, Fleet Support, Subsystems, Corporation Management, Neural Enhancement and so on. For each skill you'll see the localised name (when available), description, prerequisites and rank.
If you're logged in via Discord and have linked an EVE character with the `esi-skills.read_skills.v1` scope, the sidebar shows your training queue: skill currently training, queued skills, remaining time per skill and the capsuleer's total skill points. Data is pulled live from Fenris Creations' ESI through the server-side proxy, with no token exposed to the client.
The catalogue is the ideal aid for planning a skill plan: identify the prerequisites for a doctrine, check the rank, then queue the plan in the EVE client. The site is available in IT and EN.