Open Source PayPal Alternatives

Open Collective lets you manage your finances so everyone can see where money comes from and where it goes. Collect and spend money transparently.

Bitcoin Cash is a peer-to-peer electronic cash system. It's a permissionless, decentralized cryptocurrency that requires no trusted third parties and no central bank.

GNU Taler is a privacy-preserving payment system. Customers can stay anonymous, but merchants can not hide their income through payments with GNU Taler. This helps to avoid tax evasion and money laundering.

DASH is an open source peer-to-peer cryptocurrency that uses a system called Darksend to add privacy to transactions.

If you want to sell digital content online, there's plenty of options out there. However, if you want to sell digital content online without violating your users' privacy in the process, you'll have a much harder time finding a suitable program.

One plugin to integrate various Payment Gateways like Instamojo, Razorpay, Cashfree, Easebuzz, etc with WordPress plugins like WooCommerce, Easy Digital Downloads, Paid Memberships Pro, Learn Press, Give, Ninja Forms, Tourmaster, Memberpress, etc.

Houdini is an all-in-one fundraising platform developed in Ruby on Rails. It’s licensed under AGPL/LGPL and is available, without cost, to anyone in the world. Houdini allows you to quickly build and deploy anything from simple donation forms for individual nonprofits, to fully...

Make fundraising easier by using the world’s most accessible and intuitive software. CommitChange is built to be used by people of all technical skill levels, without compromising on features. You can jump in and start fundraising in minutes, without needing special skills or...

GroestlCoin (GRS) is a peer-to-peer Internet cryptocurrency utilizing the Groestl algorithm that enables instant payments to anyone in the world. GroestlCoin makes efficient mining possible for EVERYBODY who wants to mine – whether on an old CPU or a new GPU.

CryptoCRIT is an open-source Cryptocurrency project which facilitates a Cryptocurrency wallet for making payments. The associated Cryptocurrency is called CritCoin.