I live by rule “if everyone gave me 1 euro…” so I donate 1 euro/month to projects I use often (but I send actually 12/year to spare the devs some trx costs) and 1 euro/year to projects that I use sometimes (again I send 5 Eur/5 years actually). I use almost only open source and I haven’t yet paid everyone. I also recently made an open source application where I didn’t setup any donations channel, I simply like doing it… Maybe in the future if I have more work on it, but not now…

Yearly budget of $200 for any apps I constantly use. I split the amount between the apps. Donate more if I have extra funds.

I donate to Signal. I intend to increase my contributions to other open source (Linux) projects this year though. I expect them to need it more than ever soon.

The annual KDE reminder works on me. I also donate yearly to thunderbird and other random foss projects that are important to me like pihole. I pay for bitwarden to support them while keeping an instance of vaultwarden running as backup.

The other thing I try to do in lieu of donating is turning on metrics for applications I use daily when the option is there and whitelisting those domains in pihole.

I donate 100€ to KDE every year. I consider it my “windows license”, since it was the DE that allowed me to escape from windows 7 years ago.

Infrequently. Sometimes like 5 euros. Could do more but I am not fully reliant on open source. I wish ublock origin accepted donations though.

What I will say is that if you donate small amounts, saving up is better if possible. I know some charities I donate to mentioned transaction charges could be 1 or 2 euros per transaction. So donating a low amount could really eat into your donation.