fig2ps is a script for converting xfig files to PS or PDF, processing text using LaTeX. It is intended to help typeset good quality documents, where the font on the pictures is exactly the same as the font in the text. The advantage it has over some other xfig exporters such as eepic is that you compile the picture only once and not every time you compile your LaTeX file, giving a great gain in speed with complex pictures. It should work with LyX.
Scientists have to deal with a great amount of experimental data of different kinds, often assorted with parameters (the conditions of the experiments). It is often difficult to remember the results and conditions of all experiments. SciYAG aims at make this task easier by letting you organize scientific data along with experimental conditions. It provides fast display/overlay of data and a search engine ("When did I do this experiment under these conditions?").
Tioga is a Ruby library for creating figures and plots with high quality text and graphics in PDF format. Text is processed directly by TeX (not an emulation), and the graphics covers a broad range of PDF features including images, curves, clipping, and transparency. Tioga is relatively easy to use, complete, and well documented.