I use a variety of open tunings (sometimes called "altered" or "alternate" tunings). In fact, very few of tunes I've ever written have been in standard, EADGBE tuning. For you fingerstyle devotees out there, here are the tunings for some of my tunes:

 

Jade (2003 Redtail Records RT-1028):

DACGCE Dragondance

CGCGCE The Shawinigan Handshake; Redtail Circles the Sun

EBEF#BE Tumblehome; Causeway

C#G#C#F#A#C# Si Bhig, Si Mhor; Banana Seat Boy

BF#C#F#BF# Dharma Bomb

DADGAD Lone Ranger & Tonto; Ragamuffin; To Leave the Heart Behind

FACFCF Berkley Springs

 

Red Havens Rising (1999 Redtail Records RT-1028):

Invitation to Circumstance: Open-C (CGCGCE)
Kicking Bird: 12-string, tuned down 1/2 step (D#G#C#F#A#D#)
Buffalo People: Drop-D (DADGBE)
Acadie: Open-G (DGDGBD)
Days Between Stations: Drop-D (DADGBE)
Je t'aime: A#D#F#A#F#G# (capo at the 5th fret)
Strength, Broken By Strength, and Still Strong: Drop-D (DADGBE)
Red Havens Rising: DADGAD
As Far As She'll Go: Drop-D (DADGBE)