Aidbuilder is described as 'Online social fundraising platform for non-profits providing custom features and white-label integration'. There are four alternatives to Aidbuilder, not only websites but also apps for Self-Hosted solutions and Wordpress. The best alternative is Charitable, which is both free and Open Source. Other great sites and apps similar to Aidbuilder are BetterNow (Paid), Revv Online Fundraising Platform (Paid) and Fundraising for WordPress (Paid).
Revv is the fundraising platform that raises organizations more money. Revv's powerful donation maximization features like marketing automation and up-sells along with many integrations help non-profits, political campaigns, and causes fundraise.