DragonFly belongs to the same class of operating systems as other BSD-derived systems and Linux. It is based on the same Unix ideals and APIs and shares ancestor code with other BSD operating systems. DragonFly is differentiated from other operating systems in its class by, among others, the HAMMER file system, Virtual Kernels, swapcache, and the pervasive use of soft token locks. DragonFly provides an opportunity for the BSD base to grow in an entirely different direction from the ones taken in the FreeBSD, NetBSD, and OpenBSD series.
histbackup makes incremental backups of a directory tree in a set of directories named by dates, or date-time if the date already exists. Its companion script histbackup-prune controls the archive growth. The new backup is prepopulated by hardlinks of each file from the previous backup and then updated with rsync(1). This arranges that the only new content of each new backup is fresh copies of the changed files. In this way each backup directory is a full copy of the source directory but the disk space cost is that of an incremental backup. Because it uses rsync, it is possible to efficiently backup remote directories in this manner.
ECB is a source code browser for (x)emacs. It displays a couple of windows that can be used to browse directories, files, and file contents like methods and variables. It supports source code parsing for languages like Java, C, C++, Elisp, Scheme, Perl, TeX, LaTeX, etc. In addition, it offers an (optional) permanent "compile window" at the bottom of the emacs frame, which is used to display all help and compile output. The rest of the frame is called the "edit area", which can be divided into several edit windows that are used for editing the sources. Deleting some of the edit windows neither destroys the compile window nor the browsing windows. It requires the CEDET suite.
gtkdialog is a GUI creation utility that can be used with an arbitrary interpreter. It enables the programmer to describe a graphical user interface in a simple XML language, and create callbacks with any interpreter that supports either files, standard I/O, or environment variables. It can be called as an external program from the interpreter, but can be used as a stand-alone framework for the application as well. Stand-alone, bash, and awk examples are provided.