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Live Trace Visualization for Large Software Landscapes
ExplorViz is a web-based software visualization for large software landscapes.
It features two different perspectives: the landscape-level perspective and the application-level perspective. The former visualizes the systems, nodes, and application existing in the software landscape. The latter one utilizes the city metaphor to visualize the entities and communication happening in one application.
C and C++ control flow graph generator and analyzer
CoFlo generates Control-Flow Graphs from C and C++ source code. It can then output the graphs in a number of ways and perform various control flow analyses.
NOTE: CoFlo has not been under active development for several years. At this time, I suggest you look into LLVM-based tooling to see if there is anything similar to CoFlo which will meet your needs.
ccglue is a complementary tool to cscope and ctags. The tool builds a cross-reference symbol database from cscope [and ctags] databases that can be used to display dependency-graphs (aka call-trees, code flow). Visualization can be done with the Vim CCTree plugin (http://www.vim.org/scripts/script.php?script_id=2368), or the built-in stand-alone command-line tracer.
jSET - Java Software Evolution Tracker is a software visualization tool that allows practitioners to assess the magnitude of changes across the versions of a software system.
PyCDep is a tool to analyze include dependencies between files in C and C++ programs. PyCDep itself is written in python. It dumps all the facts in a prolog database which can be queried. Visualization is possible by dumping graphviz (.dot) files.