Marvin Sketch allows users to draw compounds, import existing compounds, edit their structures, depict reactions, and perform many other tasks. It is a Java-based program provided by ChemAxon.
MarvinSpace allows high-powered visualization of chemical structures in 3D. It can be used on a range of platforms including Windows, Linux, Mac OS X, and Solaris
Marvin View provides a large set of visualization tools to allow the viewing of one or more compounds or reactions. It is a Java-based program provided by ChemAxon.
In addition to MarvinSketch, MarvinSpace, and MarvinView, ChemAxon provides several additional tools such as the Reactor and Fragmenter tools that could be useful to biochemists.