PLplot is a library of C functions that are useful for making scientific plots from programs written in a wide variety of languages. It can be used to create standard x-y plots, semi-log plots, log-log plots, contour plots, 3D plots, shade (gray-scale and color) plots, mesh plots, bar charts, and pie charts. Multiple graphs may be placed on a single page with multiple lines in each graph. Different line styles, widths, and colors are supported. A virtually infinite number of distinct area fill patterns may be used. A variety of output devices and file formats are supported.
Teddy is an OpenGL-based 3D graphics library written in C++. Its main features are simple scene graph and windowing system-enabling multiple cameras, camera windows, and scenes. It focuses on easy and flexible manipulation of models and model materials in the scene graph. It contains a number of primitive objects like sphere, box, and cone, and it can load LightWave object and scene files.
PLies is a Perl script used to split an input HTML file into multiple slides which are then presented using CSS. Slides can be navigated using the keyboard, the presentation can be packed as zip file for distribution, and arbitrary Perl code (like the included example to create HTML bar graphs) can be executed while creating the presentation.
MpFot allows you to create MetaPost files from images in JPEG or GIF format. It uses Java2 and can optionally process the images before rendering to MetaPost files. MpFot can currently modify brilliance, color balance, and saturation, and it can also perform posterization, inversion of colors, and manual cropping. All the changes can be compared with the original image through a courtain-like facility.
ppmcaption adds text to PPM, PGM, or PBM images. Multiple blocks of text can be placed on the image, with varying fonts, font sizes, colors, transparency, and alignment. Any BDF font file can be used for the text. The advantage of using this program instead of a pipeline of PBM filters is that ppmcaption is much faster and easier to use.