graphviz is a set of graph drawing tools and libraries. It supports hierarchical and mass-spring drawings; although the tools are scalable, their emphasis is on making very good drawings of reasonably-sized graphs. Package components include batch layout filters and interactive editors for X11, Java, and a TCL/tk extension. The batch filters can be configured as a web visualization service (using GIF and click-maps). Typical applications include display of finite state machines, software diagrams, database schemas, and communication networks.
yplot is an interface to the PLPlot plotting library written as an extension of yorick. This combination allows one to quickly and easily create high-quality scientific plots from data, even in large structured files. yplot implements 2D line and scatter plots, contour plots, 3D surface, mesh and scatter and line plots. The user is given full control over every aspect of the plot, including symbol types, line types, label placement, fonts, etc. The results can therefore be made suitable for high-quality scientific presentation. A 60 page Postscript tutorial is included with examples and a reference section.
Web Photo Album automatically generates photo albums on the fly from directories containing your favorite photos. Supports captions (including HTML tags), definable page sizes, forward and reverse preview, and index pages. All preview and index pages can be clicked to jump straight to the page that contains them. Album maintenance is easy -- just add or remove photos and (optionally) captions to your album directory.
Quick Image Viewer (qiv) is a very small and fast GDK/Imlib image viewer designed to replace the classic image viewers like xv or xloadimage. It features setting an image as an X11 background with a user-definable background color, fullscreen viewing, a screensaver mode, brightness/contrast/gamma correction, real transparency, zoom, slideshow, support for external programs, and more. It runs on Linux (libc5/glibc), Solaris (SunOS), FreeBSD, and HP-UX.
Siag Office is a free office package which consists of the spreadsheet Siag, the word processor PW, the animation program Egon, the text editor XedPlus, the file manager Xfiler and the previewer Gvu. Siag is easy to use, yet infinitely flexible through multiple embedded interpreters and a plugin mechanism that allows other programs to run inside the main document. The supported interpreters are SIOD, Guile, Tcl, and Python.
tgif is a vector-based drawing tool, with the additional benefit of being sort of a web-browser. That is, you can fetch drawings from a web server with it, and you can make objects in your picture into hotlinks to other parts of the drawing, or to other drawings accessible via HTTP.