GDB, the GNU Project debugger
GDB, the GNU Project debugger, allows you to see what is going on `inside' another program while it executes -- or what another program was doing at the moment it crashed.
GDB can do four main kinds of things (plus other things in support of these) to help you catch bugs in the act:
* Start your program, specifying anything that might affect its behavior.
* Make your program stop on specified conditions.
* Examine what has happened, when your program has stopped.
* Change things in your program, so you can experiment with correcting the effects of one bug and go on to learn about another.
The program being debugged can be written in Ada, C, C++, Objective-C, Pascal (and many other languages).
Valgrind
Valgrind is an award-winning suite of tools for debugging and profiling Linux programs. With the tools that come with Valgrind, you can automatically detect many memory management and threading bugs, avoiding hours of frustrating bug-hunting, making your programs more stable. You can also perform detailed profiling, to speed up and reduce memory use of your programs.
The Valgrind distribution currently includes four tools: a memory error detector, a cache (time) profiler, a call-graph profiler, and a heap (space) profiler.
Evince
Evince is a document viewer for multiple document formats. It currently supports pdf, postscript, djvu, tiff and dvi. The goal of evince is to replace the multiple document viewers that exist on the GNOME Desktop with a single simple application.
GraphViz
Graph visualization is a way of representing structural information as diagrams of abstract graphs and networks. Automatic graph drawing has many important applications in software engineering, database and web design, networking, and in visual interfaces for many other domains.
Graphviz is open source graph visualization software. It has several main graph layout programs. See the gallery for some sample layouts. It also has web and interactive graphical interfaces, and auxiliary tools, libraries, and language bindings.
udev
Managing device nodes in /dev on Linux.
主页：http://www.kernel.org/pub/linux/utils/kernel/hotplug/udev.html
AWStats
Advanced Web Statistics (AWStats) is a free powerful Web server logfile analyzer (Perl script) that shows you all your Web statistics including visits, unique visitors, pages, hits, rush hours, search engines, keywords used to find your site, robots, broken links, and more. It works with both IIS 5.0+ and Apache Web server log files as a CGI and/or from the command line. It also supports multiple languages including English, French, Dutch, Spanish, Italian, German, Polish, and Greek.
Xdebug
The Xdebug extension helps you debugging your script by providing a lot of valuable debug information. The debug information that Xdebug can provide includes the following:
* stack and function traces in error messages with:
o full parameter display for user defined functions
o function name, file name and line indications
o support for member functions
* memory allocation
* protection for infinite recursions
Cairo
Cairo is a 2D graphics library with support for multiple output devices, both raster and vector.
It focusses on high quality output at display resolutions and features an extremely easy to use API.
这些软件是Ohloh社区评选出来的优秀开源软件，est翻了大概20多页，排名在90以上的，发现就这几个不认识
