Various system preferences can be set within the welcome screen.

ubuntu-mate-welcome

Welcome screen for Ubuntu MATE

toy train simulation game

ri-li

toy train simulation game

Ri-li is a game in which you drive a wooden toy steam locomotive across many levels and collect all the coaches to win.
indicator showing the main menu from Gnome Classic

classicmenu-indicator

indicator showing the main menu from Gnome Classic

Educational Typing Tutor Game Starring Tux

tuxtype

Educational Typing Tutor Game Starring Tux

TuxTyping is an educational typing tutorial game starring Tux, the Linux Penguin. The player guides Tux to eat fish which are falling from the top of the screen. Each fish has a letter written on it. When the player presses the corresponding key, Tux will position himself to eat the fish. The game is intended for children learning to type, though it does have higher difficulty levels which even experienced typists may find challenging.
Screenshot of all three tribes available

widelands

fantasy real-time strategy game

Widelands is a strategy game aiming for gameplay similar to Settlers II by BlueByte.
a free video editor - GTK version

avidemux

a free video editor - GTK version