German Ergonomic Keyboard Layouts: de-ergo, NEO, ADNW
Here's a list of ergonomic keyboard layout for German language.
de-ergo layout
The de-ergo layout is perhaps the earlist optimized layout for Germany language.
http://forschung.goebel-consult.de/de-ergo/
NEO Layout
The NEO layout is efficient layout for German. Neo layout improved on de-ergo layout. Neo layout is started in 2004 by Hanno Behrens.
Home page http://www.neo-layout.org/ and original site http://pebbles.schattenlauf.de/layout/index_us.html

The neo layout has all vowels on the left hand side, so it optimize typing by altering hand, like Dvorak Keyboard Layout.
Neo layout version 2 is released on 2010-03-29. It changes the positions of X J Q keys by cyling them in that order. Also, new arrangement for layer 3, and added layer 4, 5, 6.
ADNW Layout
the ADNW (Aus der Neo-Welt) seems a improvement on Neo.
ADNW home page at: http://www.adnw.de/

Keyboard Layouts
- QWERTY
Ergonomic keyboard Layouts
Thumb Keyboard Layouts- Most Efficient Layout?
- Maltron vs Dvorak
- Colemak vs Workman
- Typing Multi Layouts
Dvorak
Dvorak Layout- Hardware vs Software Dvorak
- Myth of QWERTY vs Dvorak
- Dvorak vs Programer's Dvorak
- Dvorak vs Colemak
- List of Dvorak Keyboards
- Qwerty to Dvorak, A PhD thesis, 1978
International
International Layouts- QWERTZ, AZERTY
German
German Ergonomic
French- New French Layout
French Ergonomic- French Letter Frequency
Russian- Russian Layout and Programing
- Portuguese Ergonomic
Chinese Input Methods- Pinyin Letter Frequency 拼音字母頻率
Japanese Input Method
Japanese Layouts- Japanese Char Frequency