Involve - Get behind-the-scenes access to your favorite nonprofits
Creddon - Tweet for a cause and a sponsor will donate $1 to charity
All or Nothing - Competitive donations for causes you care about.
Send Mail Get Mail - A postcard-sending website.
Software Donation - Donate tools to enable remote work during COVID-19 outbreak
Postacard - Text a photo to send it as a postcard for $3.