There is a lot of great software out there which helps aid in chord look-up, tab-writing, tuning, and more. I only list 100% free software of the highest quality.

Power Tab-This is the best tab-writing software there is. Here are of the features:

• Playback tabs as midis
• Write scores or tabs, output just one or both.
• Chord Lookup
• Automatically organizes tabs and includes legends, chords, legal notices, ect.

Mini Tuner-Don't want to buy a $35 tuner? Why not just use your computer.

EasyChord-The fastest and easiest way to lookup chords. Also includes reverse chord lookup(for looking up the names of chords.)

Audacity-Record yourself playing and put in on the internet, or on a cd. This is also very useful for hearing how you really sound vs. the way you hear yourself.