Every year on the Tuesday after Thanksgiving, groups around the world encourage kicking off the holiday season with charitable gifts. The unofficial holiday, known as #GivingTuesday, was launched in 2012 in response to the onslaught of commercialism on Black Friday and Cyber Monday.

It’s likely your favorite charity or nonprofit is running a #GivingTuesday campaign this year. If you want to double your impact, here are some national charities and foundations that are offering to match donations they receive this Tuesday.

The ACLU, which fights to uphold the individual rights protected by the Constitution, will match donations up to $500,000 total.

The emergency-relief group will match donations up to $50,000.

The nation’s largest no-kill animal sanctuary, which works to promote pet adoption, will match all donations it receives Tuesday.

The Gates Foundation, which focuses on reducing poverty and expanding access to health care, has teamed up with the social media giant to match funds raised via Facebook’s fundraising tool. The groups will match up to $1,000 per fundraiser.

Motivational speaker Tony Robbins pledged $3 million to match donations made to Feeding America this Tuesday, with a goal of providing 100 million meals via food banks, shelters and other community groups.

Heifer International seeks to curb global poverty by distributing animals to families and giving people agricultural training to become economically self-sufficient. The charity is matching donations made this Tuesday up to $855,000 total.

This organization, devoted to researching Parkinson’s disease, will match all donations it receives Tuesday (up to $1 million total).

The American branch of the worldwide anti-poverty group is matching all gifts up to $5,000.

Many corporations offer to match their employees’ charitable donations up to a certain amount per year. Use this search tool to see if your company will match your gifts.