All the software from Contaware.com are Donationware, it is requested to donate $10 USD per installation to cover the costs. Software and web site are completely FREE FROM ADS. The source code is published under the terms of the GNU GENERAL PUBLIC LICENSE. After donating through one of the below alternatives, please contact us because we have to manually add you.
1. Donate 
ethereum cryptocurrency to this address:
0x3DF8dD76361f71BcfD1CaFDd48f5ccC0d162DE83
Hint: to lower the transaction fees, instead of sending through the Ethereum Mainnet, you can use the same address to send over Arbitrum One, Base Mainnet or Optimism (OP Mainnet).
2. Donate by doing a wire transfer to:
Beneficiary IBAN
CH52 0483 5038 9882 6000 2
Beneficiary Name
Oliver Pfister
Ai Ciòss 49
6672 Gordevio
Switzerland
Bank
Credit Suisse, 8070 Zuerich
BIC/SWIFT: CRESCHZZ80A
Account: 80-500-4
Legal notice: by making a donation to the Contaware.com projects you signify that you acknowledged, understood, accepted, and agreed to the terms and conditions contained in this notice. Your donation to the Contaware.com projects is to cover the costs of software development and web site maintenance and is not a fee for any services, goods, or advantages, and making a donation to the Contaware.com projects does not entitle you to any services, goods, or advantages. We have the right to use the money you donate to the Contaware.com projects in any lawful way and for any lawful purpose we see fit and we are not obligated to disclose the way and purpose to any party unless required by applicable law. Contaware.com projects do not have any tax exempt status (Contaware.com is neither a registered non-profit corporation nor a registered charity in any country). Your donation may or may not be tax-deductible; please consult this with your tax advisor. We will not publish/disclose your name and email address without your consent, unless required by applicable law. Your donation is non-refundable.