ZMJ100 is showcasing his new Blender mesh add-ons which add important and very useful CAD like commands to Blender such as Alignment, fillet, insert, extrude along, arc.
At his Blenderartists thread he shows the progress of his scripts. Currently not all tools work yet and thus are not available to download, but their number is growing. I copied in a list of the most updated tools here:
Download: CAD Add-ons