Here are a few softwares which you would find useful.

1.Chord Maestro
Download this software to your mobile device.It contains about 10 positions to each chord and positions for all chords such as sus4, aug, dim7, M7 etc.. It also has a pitch pipe to help in tuning.And above all its FREE.

2.Guitar and Bass
This is quite a useful which you can download to your PC.It is also free.It has quite a number of tools and the thing I liked the most its Jam Band tool.

This is quite a good software for beginners to memorize the notes on the fretboard.

If you have a Acosuto-electric or an electric the following softwares will be useful. The first thing you want to do with these guitars is to connect them to pc using a converter to the line in of pc (there is a detailed post on how to do it in this forum ).

4.Pitch perfect Musical Instrument tuner
This is a Free software you don't wanna miss. You can tune your guitar, Bass, & stringed guitar, viola etc. to standard or custom tuning saving your money on electronic tuner.

This is a useful tool to record your playing, edit it, add effects, and add multiple tracks. It is quite cool and it is also FREE.

6.Ultrawave Guitar Multifx and Ultrawave Guitar Racks
These two are awesome softwares which converts your PC to an awesome sound processor. It costs less and comes with Free trial of 60 hours which everyone can try.