if you have the project hosted on sourceforge you could ask for donations. also you could charge a fee for installing setup of your open source app. so sell tha

if you have the project hosted on sourceforge you could ask for donations. also you could charge a fee for installing setup of your open source app. so sell that as a support package. lots of companies would rather pay for a license and get support even for open source. google ad used to pay well but now I don't think it would be worth it.