IFRIT 3D Data Visualization

a powerful tool for visualizing 3-dimensional data sets
IFRIT (the Ionization FRont Interactive Tool) has its origins (and hence name) in a specialized utility designed to visualize ionization fronts in cosmological numerical simulations.
IFRIT, however, has outgrown its origins and now can visualize general data sets as well.
IFRIT is written in C++ and is based on two state-of-the-art toolkits: the Visualization ToolKit (VTK) and a GUI toolkit QT.
Homepage: http://casa.colorado.edu/~gnedin/IFRIT/

This application is provided by the Ubuntu community.
IFRIT 3D Data Visualization integrates well into the Kubuntu desktop

Gwave Waveform Viewer

a waveform viewer eg for spice simulators
gwave - a viewer for the output of spice-like simulators and other viewing of analog data.

This application is provided by the Ubuntu community.

GraphThing

tool to create, manipulate and study graphs
Some of the features of GraphThing are:
* Adding, deleting and moving of vertices and edges.
* Loading and saving of graphs.
* Graph complements, induced subgraphs and line graphs.
* Quick creation of many common graphs (complete, cycle, null, star, etc.).
* Determination of shortest path, connectivity and Eulericity.
* BFS, DFS and Minimum Spanning Tree.
* Adjacency matrix (including exponents) and degree sequence.
* Chromatic polynomial and chromatic number.
* Network algorithms: Maximum network flow.
These `graphs' are mathematical objects that describe relationships between sets; they are not 2D plots, charts, or anything similar to that.
At the moment, only simple graphs and digraphs are supported; that is, no multiple edges or loops.
Other than this, GraphThing can handle every type of graph.
Homepage: http://graph.seul.org/

This application is provided by the Ubuntu community.