Bukkit

September 26th 2013:

• Updated for 1.6.4
• General bug fixes

August 25th 2013:

• Fixed a typecast error
• Added configuration file for minimum damage and velocity. If both are set to zero, the blood effect will play for any amount of damage.
• Added sound effect

Working on a new effect for blood, and will be adding toggles for mobs in the config.

August 16th 2013:

• Updated for CB1.6.2
• Fixed bugs
• Modified blood effect

ANNOUNCEMENT: More to come soon

January 18th 2013:

• Added support for CB1.4.7

January 14th 2013:

• Added new blood effects
• Added critical hit blood
• Fixed bugs

December 12th 2012 (12/12/12):

• Fixed bugs

None that I know of