Ipe: Vector Graphics
"Ipe extensible drawing editor is a free vector graphics editor for creating figures in PDF or EPS format. It can be used for making small figures for inclusion into LaTeX documents as well as making multi-page PDF presentations. It is developed by Otfried Cheong since 1993... Ipe lets users draw geometric objects such as polylines, arcs and spline curves and text. Ipe supports use of layers and multiple pages. It can paste bitmap images from clipboard or import from JPEG or BMP, and also through a conversion software it can import PDF figures generated by other software. It differentiates itself from similar programs by including advanced snapping tools and the ability to directly include LaTeX text and equations." (Emphasis Added) See Wikipedia: Ipe
Screenshot of example Ipe file:
Ipe Manual: PDF
Ipe Wiki with instructions on how to download on various operating systems
Windows Download: SourceForge Ipe7 Page
*** If for some reason, you are not able to launch Ipe7, double check that these extra dlls (or newer versions of them) are also in the Ipe bin folder. To run, double click ipe.exe, also in the bin folder. Zip File contains: (cairo.dll, freetype2.dll, lua51.dll, QtCore4.dll, QtGui4.dll, and zlib.dll).