It's rare that I come across software with such thoughtfully designed UI and great UX where everything just works™, including things you didn't know you needed. I felt like I immediately knew where everything was (even without toggling the simplified mode). I use LosslessCut from time to time to make small looping videos for my blog, and after my first use I immediately went to donate to the developer. I remember even writing some detailed paragraphs about why it's so good in the PayPal message, but something went wrong and PayPal lost it, so it was a silent donation in the end. Definitely in my global top 5.