I am from Kerala, India. I want, first of all, to tell you how much I am indebted to Calibre for the very many benefits I have got out of it as a reader and book lover. I started with getting all my Kindle and Google books (about 200 of them) de-DRMed; then I formatted each of them, deleted unwanted pictures/pages, changed the cover if I didn't like it . . . did all sorts of things using Calibre till the book was perfect in my eyes. Then, recently, I made Calibre my e-book library, put the library in Dropbox so my notes and highlights will sync, and made the Calibre E-book viewer my primary e-reader. Following the directions of Google Gemini and using AutoHotkeys, I changed the icon of the E-book viewer, removed the unwanted words from its title bar ([Ebub], E-book viewer), created a new right-click context menu and made it a minimalistic, clutter-free, super-clean e-reader. Do take a look at the screenshots I have attached.
All to say that I am very thankful to you (Goyal ji). I wanted to make a small donation to you, but Paypal doesn't allow the payment. What to do?