If you want to plug your guitar into your Mac, PC, or Android USB OTG device, then the Behringer Guitar Link UCG102 USB interface will get the job done cheaply.
M-Track from M-Audio is a portable two-channel USB audio and MIDI interface that is specifically designed to work with almost any DAW or music production software.
Some of you may be wondering why I've been a little quite here lately - it's because I've been working with a team of music gear experts on a new concept called Gearank.
It takes a whole new approach to discovering which pieces of music gear are the best to buy.