JPatch is an amazing 3D Modeling/Animation tool designed to model and animate "organic" shapes such as humans, animals, aliens, etc. It is a bezier-spline modeler and works with so-called "Coon's patches", the same patches that are used by the popular Windows freeware modellers sPatch and Hamapatch and the commercial program Animation Master (they are called Hash patches there). JPatch is written entirely in Java.
K-3D is a 3D modeling, animation, and rendering system for GNU/Linux & Win32. Features include creation and editing of geometry in multiple realtime OpenGL solid, shaded, and texture-mapped views; unlimited undos and redos; complete extensibility at runtime through third-party plugins; animated procedural geometric effects; all parameters animatable through a consistent control-spline based interface; rendering pipeline to Renderman Interface compliant rendering engines; optimization for use with the Aqsis rendering engine, which features solid modelling, true displacement, and user programmable shaders; and support for background and batch rendering.
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.
LeoCAD is a CAD application that uses plastic building bricks similar to those found in many toys. This is the Linux port of the original MS Windows version; it uses OpenGL for the graphics and allows the creation of very large/complex models with a library of over 1500 different parts.
Light Lab is a hybrid GTK/OpenGL program for experimenting with the OpenGL lighting model. It lets you set the colors and positions of three GTK light sources and watch the effect they have on a simple 3D scene containing a rotating sphere, cube, tube, cone, or teapot, with an optional texture map.
Liquid PCB is a computer aided design application for designing printed circuit boards. Unlike other PCB CAD applications, you are not restricted to straight tracks and 45º angles. Instead, you can freely draw tracks any way you like, and the tracks themselves will move and bend as required to maintain your design rules. Vias and components are also free to move and rotate. The user interface exposes all functions through the multi-directional expanding mouse menu and the keyboard instead of through icons and menus.