ipe

About ipe

From Debian's package description

Ipe supports making small figures for inclusion into LaTeX documents as well as making multi-page PDF presentations Ipe's main features are:

• Entry of text as LaTeX source code. This makes it easy to enter mathematical expressions, and to reuse the LaTeX-macros of the main document. In the display text is displayed as it will appear in the figure.
• Produces pure Postscript/PDF, including the text. Ipe converts the LaTeX-source to PDF or Postscript when the file is saved.
• It is easy to align objects with respect to each other (for instance, to place a point on the intersection of two lines, or to draw a circle through three given points) using various snapping modes.
• Users can provide ipelets (Ipe plug-ins) to add functionality to Ipe. This way, Ipe can be extended for each task at hand.
• The text model is based on Unicode, and has been tested with Korean, Chinese, and Japanese.

Package lua5.3 is recommended if using Ipe with LaTeX.

Package texlive-latex-recommended enables unicode text entry (for accented characters).

From Debian's description of the ipe package, under that package's license.