Here is a fundraising campaign in Grassroots. It’s made using our Campaign extension for WooCommerce. You can specify a goal in your currency and the extension will track your progress toward reaching that goal.
Since it’s built on top of WooCommerce you can actually sell products alongside your fundraising efforts. That way everything is in one system which makes it easier for you and for your users.
Plus you can make use of the hundreds of extensions for WooCommerce that include everything from payment gateways to features like “name your own price.”