Probably the best FREE ear training resource on the internet

Fretboard Warrior is a free guitar lesson designed by Francois Brisson to help guitarists memorize the guitar fretboard. There is also a bass and a chord version available for download.

Guitar shareware software with lessons. Learn songs or study chords and scales with Desktop Guitarist. Easily create tablature and chord charts.

Power Tab Editor v1.7 (Build 80)
Tablature editor designed for use on the Windows operating system. For more information, including system requirements and screenshots, see Information.
Version 1.7 (Build 80)
Released September 24, 2000
Installs on Windows 95, Windows 98 and Windows Millennium platforms
Installs on Windows NT 4.0, Windows 2000 and Windows XP platforms
Creates, reads and plays .ptb files
Free download

(See bar on left of home page for download info.)

Audacity is a free audio editor. You can record sounds, play sounds, import and export WAV, AIFF, and MP3 files, and more. Use it to edit your sounds using Cut, Copy and Paste (with unlimited Undo), mix tracks together, or apply effects to your recordings. It also has a built-in amplitude envelope editor, a customizable spectrogram mode and a frequency analysis window for audio analysis applications. Built-in effects include Bass Boost, Wahwah, and Noise Removal, and it also supports VST plug-in effects.

KRISTAL Audio Engine is a powerful multi-track recorder, audio sequencer and mixer - ideal for anyone wanting to get started with recording, mixing and mastering digital audio.

It is designed as a modular system. The main application provides a mixing console, while the audio sequencer, live audio input and so on are loaded as separate PlugIns.

Denzo Archive Viewer (DAV) is probably the most complete guitar chord archive on internet. Using an intuitive interface you can navigate through more than 100,000 chord positions. You can present chords in text format and in graphic shapes. You can print your archive in a very good graphical resolution deciding number of chord per page. Any graphic chart can be saved as bmp picture.

DenzoQuencer (DQC) was written to offer a simple way to create music for improvisation studies. In less than five minutes you can edit a complete chord progression and use or build new harmonic/melodic/percussive patterns to give character to your progression.

Denzo Guitar Software (DGS) is a unique guitar related application. It has a level of attention to music theory that is usually is forgotten by all other guitar products. You can manage concepts such as chord/scale relationships, inversions, subscales, similar chords, tonality, harmonization, fourth harmony, analysis of chords from its notes, and others that I usually describe as harmony tools.

Denzo Music Editor (DME) is the first attempt to distribute free notation software. I didn't spend much time to make it beautiful. DME was invented to import MIDI or MUS files and create a map between music and tablature creating a graphic image to use to create some music courseware. DME allows user to copy image, play music by MIDI, copy Tab as ASCII tab in the clipboard, altering tuning to discover best tuning to play songs, adding chord shape to staff and tab, see tab while playing songs.