If you use Linux and like to play computer and video games, then running games on Linux is always a challenge to you. In addition, one of the embarrassments that Linux users have felt for years about having too many games is how do you manage them all? At this point, try Lutris, which manages your entire games library and provides the best settings for each game, so as to make running games on Linux easier and more efficient.

Rigs of Rods is an entirely free, open-source and sandbox-style vehicle simulation program for Windows and Linux platforms. It simulates cars, trucks, airplanes, boats and everything in between, and uses soft-body physics system (based on mass-spring-damper model) to simulate the vehicle physics, mainly motion destruction and deformation of vehicles.

The meaning and ideas you want to express can't be seen through code editing alone, but creating diagrams can easily show your ideas. Thus, UML (Unified Modeling Language) has been used to solve the object-oriented problems for a long time, providing a common language among analysts, designers, and programmers for software design.

GPXSee is a free, open-source GPS log file viewing and analyzing tool, developed by Martin Tůma from Czech Republic. It comes with a friendly user interface and powerful features, and is mainly used to view and analyze the GPX file (which is the common file type that GPS devices record their waypoints, providing data for GPS navigation).

BizHawk is a free and open-source multi-system universal emulator written in C#. Its goal is to eventually simulate all game consoles, and already supports FC, MD, GBA, SFC, SMS, NES, SNES, N64, PC Engine, SS, PS, PSP, and so on more than 10 game consoles. It comes with the professional TAS functions while taking the ease of use into account. That said, BizHawk not only can be used for game clearance video production with TAS, but also is friendly for casual gaming.