A program to draw simple geometry (points, lines, dotted lines etc.) I am looking for a program to create images of very simple situations, e.g. this. I have already tried Geogebra but I am not quite satisfied with the result. I want my images to look as if they were taken from some (geometry) book; this is what I mean:

This was taken from my last year's geometry lecture notes. I feel like everyone is using the same program to create such images (because they all look the same). 
Does anyone know what program I could use in order to create such images? I'm sure I could succeed with both MS Paint and Adobe Photoshop, but I'm looking for some program made to create such images. I hope this is the right place to ask for this and thanks for any help in advance.
 A: You may want to try Tikz. See http://www.texample.net/tikz/ for examples.
A: I use Omnigraffle for the Mac. It is by far the easiest figure-maker for mathematics and is LaTeX friendly. Simply drag and drop predefined shapes (including points, lines, polygons, etc.) within Omigraffle, adjust them as needed for size, opacity, color, etc., use LaTeXIt to add labels or equations, save, then export to pdf or eps. I created the following faithful reproduction of your image by sight in 45 seconds.

A: You might also try out DrGeo which is a interactive geometry program.


Screenshot 1 source: http://screenshots.debian.net/screenshots/d/drgeo/2090_large.png
Screenshot 2 source: http://blog.ofset.org/public/drgeo/DrGeoII-2cercles.png
A: I have been enjoying kseg. It is very quick to draw diagrams in kseg.
After you draw the diagram you can drag the components around and the others will follow, retaining the same constraints. For example, in this diagram it appears that $NM$ is the perpendicular bisector of $PQ$:

And I can see if that still appears to be the case even after I move point $C$ to make a very different inscribed quadrilateral:

A: If you do not like coding and looking for WYIWYG, then Ipe is a good option. 
If you like coding, then you have many options: PSTricks, TIKZ/PGF, Metapost, Asymptote, ...
A: Euklides produces pretty nice geometry sketch.

A: Crealesson feels like a blackboard drawings as multi-board something like power-point. produces small videos without any additional software.

