Free and Open-Source Software for Designers & Creative People
Sketch is the industry standard for High-fidelity UI/UX design, It is also my favorite tool for the past 4 years, I love the plugins, and the integration with other tools (InVision, Zepplin, etc). But as a UX designer, I also use Adobe products (for design related tasks), and Axure RP (for low-fidelity wireframes, UX architecture, and mockups).