This one comes in handy in A LOT of situations.
Quoted: In this jazz guitar chords lesson you will learn 20 ways how to comp a II V I VI chord progression...

Giant Steps is the best known example of the Coltrane Matrix.

Quoted: In this guitar lesson you will learn how to comp over John Coltrane's Giant Steps in a creative way...

Yet another guitar chord builder. This one makes some pretty reasonable suggestions for fingerings.

Quoted: Chord finder, including split chords and chord variations. Also features standard and exotic guitar scales for lefthanded guitar.

This chord calculator shows a bunch of the standard fingerings. Pretty complete too...everything but the most obscure altered chords.

Quoted: Guitar chord generator and scale calculator. Calculate fingerings for any chord on any stringed instrument in any tuning. Includes many other useful tools such as chord namer and tab mapper.

An excellent chord and scale builder.

Quoted: Find guitar chords and scales with this guitar chord finder.

Chromatics are easy to understand and execute and they give you a jazzy sound.

Quoted: Adding chromatic notes to guitar scales gives them a jazzy flavor. This lesson will show you how...

Quoted: Learn how to walk a bass line and comp chords at the same time.

Jazz comping over 12 bar blues in Bb.

This expands the II-V-I progression to include other popular jazz chord progressions.

Quoted: The most popular chord progressions in jazz, a list of songs that use similar chord progressions and the jazz guitarists who recorded these songs.