xcyrBGR - The Bulgarian Cyrillic keyboard layout manager for X11 

Easy toggle layout <English/Cyrillic-BDS/Cyrillic-PHOnetic> 
Mouse click to toggle encoding (Win-CP1251/KOI8).

Cyrillic fonts for X11 (koi8 and cp1251):
${MASTER_SITES}/XFree86-3_cyr_fonts_koi_cp1251.tar.gz
${MASTER_SITES}/XFree86-4_cyr_fonts_cp1251.tar.gz