Donating to charity before the end of the year can reduce tax burden and help you feel good about help others in need. I’ve found a number of apps make it possible at the touch of a button. Pledgeling is an app that allows you to find and donate to thousands of verified nonprofits, make donations on the go, and build your charitable profile. Pledgeling doesn’t charge fees and is free for the donor and the charity. It stores your payment info securely. And, of course, you can consolidate your giving history and tax receipts into one spot so keeping track of donations is easy. The app is free for Apple’s…