DirectGuitar a 9Gb direct-recorded sample library with natural decay. Combined with amp simulators it allows users to create an infinite number of guitar sounds. For NI Kontakt 2, Giga 2-3 and SFZ freeware player.
(shareware) FretPet is a guitar-oriented music sequencer. Its dynamic interface makes writing music fun and surprisingly easy. FretPet is centered around the six-string guitar, so it makes an ideal reference tool for finding the names of chords on the fretboard. The program can show you any chord in any tuning.
Tablatures is a guitar tablature editor. Tablatures is compatible with PowerTab, which is a well-known and widely adopted tablature editor for Windows systems. You can easily find thousands of song transcriptions in this format on the Internet.