Rufus is a must in every tech enthusiast's toolkit. It's one of the best applications for creating bootable USB drives thanks to its simplicity and ease of use.
TeamViewer is a well established app and an intuitive way to remotely control computers, tablets, and smartphones. It is free for personal use available for all major platforms.
VirtualBox is a cross-platform virtualization application that enables you to run virtual machines on top of your existing OS. You can download it free of charge for Windows, macOS or Linux.
HalloApp is a new social network built for privacy by two ex-WhatsApp early employees. They promise no ads, to never use personal information, and end-to-end encryption.