Comment Guitarix (Score 5, Informative) 223
As everyone has noted, Ardour is great for recording. Another really useful tool is Guitarix which is a fantastic guitar amp and effects modelling piece of open source software. Plug your electric guitar directly into your computer via a USB interface (I use my Rocksmith connector) and you can amp/effect model in Guitarix and record as you play in Ardour. Add the Hydrogen and you've also got your drums playing and sync'ed as you record. As well recording, these make a great set of tools for guitar practice.