Here goes all the stuff, that does not fit into one of the other categories.
A running LED circuit, where multiple LEDs light up simultanously.
A circuit to record the altidude in an R/C-plane on a SD-Card.
Stripboard layout with Inkscape (93 kB)
This is an SVG-file to plan the position of electronic components on a stripboard with Inkscape. With the correct grid settings this works quite nicely. Not much of a component library there, just some basic components. An example of use can be found here.