OpenPetra is an administration software for charities and can be used to manage personnel, supporters, book keeping, gift receipting, accounts payable, etc.
The Kardia software system is a browser-based CRM, donation, and finance system designed specifically for nonprofit missionary/humanitarian/NGO organizations. It is open-source software and may be freely used by anyone, and is powered by the open source DDSL (declarative domain-specific language) Centrallix application platform.
Billing system solution. Library for credit card/ACH processing, recurring billing and subscription management for member and donor centered organizations. Provides a way for POS / retail / recurring credit card and bank account processing.
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Konnections is an open source Donorbase / DonorManagement System. The program tracks donors, gifts, and pledges; it does reporting, mail and email merges, and exports. Our goal is to add useful features for non-profit organizations. Donor base.