Comdirect Depot Viewer
For years I was searching for a good website/app to be able to always check and analyse my stock depot. I ended up coding my own solution (code on GitHub) based on the online trader Comdirect.de. They offer free test depots with the nice feature "Show my depot to friends" - which seemed perfect to gather the data. A few lines of php to parse and reformat the HTML Output. That's it!
(Everybody with a comdirect depot can use my little solution! Just append your portfolio_key to the script path. It works fine as a smartphone bookmark.)