Other from Vitalik Buterin

Android

Android is a mobile operating system based on a modified version of the Linux kernel and other open-source software, designed primarily for touchscreen mobile devices such as smartphones and tablets.
Vitalik Buterin
Entrepreneur
The Android ecosystem produces awesome results and I use it every day.
Other from Vitalik Buterin

Mozilla Firefox

Mozilla Firefox, or simply Firefox, is a free and open-source web browser developed by the Mozilla Foundation and its subsidiary, the Mozilla Corporation.
Vitalik Buterin
Entrepreneur
Firefox has moved forward rapidly over the last couple of years. Highly recommend it.