Nikola Smolenski:
I suggest to change this to simply: "licensed under the GNU GPL v3 or any later version."
I don't think this is a good idea. The GPL is one of the most restrictive open source licenses and using it automatically could hinder reuse later. A better choice might be something like the CDDL or MPL, which are also copyleft.
Users who want to use a very strict license would still have the option of doing so.
(BTW: I like the suggestion to let users specify a license for all of their tools, rather than having to do each one individually.)
- river.