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I find IPE to be a life-savior when it comes to generating physics illustrations which come with their share of math toppings. The editor has nice utilities for latching on to the boundaries, intersection, center etc of geometric figures. The spline tool is the best I have seen anywhere. Layers are handled with grace. LaTeX is rendered instantly. It is very easy to produce a multipage document. What more can one possibly want?
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Culture Codes - Company culture decks aggregated all in one place
LaTeXDraw - LaTeXDraw is a graphical drawing editor for LaTeX.
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.
draw.io - Online diagramming application
Culture Your Culture - Finally, the much needed step-by-step "how to" for culture