https://wiki.lazarus.freepascal.org/How_to_donate_to_Lazarus#Contribute_moneyContribute money
From time to time people ask if they can contribute financially to Lazarus. One of the possibilities is to offer a bounty. The Lazarus team also has a PayPal account that you can use to donate USD or euros. To minimize overhead, the PayPal account is set on the name of one of the Lazarus team members, Felipe Monteiro de Carvalho. The current PayPal fees are $0.30 + 3.9% for payments in US Dollars and €0.35 + 1.9% for payments in euros.
You might also consider to donate to the Free Pascal and Lazarus foundation.
Is this still accurate? The whole page has not been updated since 2010 apart from some very minor edits for links, categories, template fixes etc.