Vectoroids is based on the X-Window PDA game 'Agendaroids,' but uses libSDL for graphics, sound, and input, and includes nicer graphics, sound effects, and music. The objective is to survive wave after wave of giant rocks, which you must shoot to break into smaller pieces, until they are completely destroyed.
KaGez-Production aims to make game developing under Linux easier. Tutorials and examples, reaching from simple console applications (non- graphical) to OpenGL games, are available, as well as tools like Image-Viewers, and 3D-Model viewers. All applications will be made for Linux only, most graphical items will work with GTK+/GNOME.
Yanoid is Yet Another arkaNOID/breakout clone, but it has been designed to be very flexible and extensible. The main engine is written in C++, but maps, objects, etc are defined in Python, which allows you to design very interesting maps. Yanoid is quite enjoyable. It requires SDL, SDL_mixer, and Python in reasonably new versions (currently SDL >= 1.2.2, Python >= 2.0).
Frozen Bubble is a game in which you throw colorful bubbles and build groups to destroy the bubbles. In one-player mode, you must destroy all the bubbles to access the next level. In multi-player modes, the goal is to have your opponent die before you. Local one-player and two-player modes are supported, and networked play is supported for modes ranging from two to five players.