The day after "Cyber Monday" was dubbed "Giving Tuesday" and several Houston billionaires were named on Forbes' America's 50 Top Givers list.

John and Laura Arnold came in at number 12.

The Enron billionaire and his wife gave more than $204 million in charitable donations in 2012.

Houston Texans owner Bob McNair landed at number 29 on the list. McNair and his wife Janice gave $50.3 million in 2012.

George and Cynthia Mitchell, of Galveston and The Woodlands, gave $39.5 million in 2012. George Mitchell died in July 2013.

Kinder Morgan CEO Richard Kinder and his wife Nancy donated $23.6 million in 2012 to come in at number 50.

Bill and Melinda Gates topped the list.

The Gates' donated a staggering $1.9 billion dollars through their respected Gates Foundation.

You can see the complete list here.