PrivateKeys.lol is a project made to educate people about Bitcoin and 256bit security. It is also pretty fun to try and find an active wallet.
The code that generates the keys is 100% open source, licenced under the MIT licence.
If you want to support PrivateKeys.lol, you can make a donation. Any support is greatly appreciated.
13JaQCzw9hR5Leg9fsZq7ZmXkCtRFLz8AqView on Blockchain.info
0x668e5E182eFa379DD0F1Ae613cCa68d1eb8bcC43View on Etherscan
You can also use this address to donate any ERC20 token.