Recount 

Renames all files of a directory by using a counter. Therefore the files can even be sorted by the files timestamp, so you're f.e. able to merge video files from different cameras into one sorted directory ;)

Screenshot
Tcl/Tk software! If You want to use a source code archive You will also need an up to date Tcl/Tk interpreter to execute it. And maybe You will need some extra libraries, too (which ones is specified inside the source archive).

Some words about my software All software was written for my own use. It works exactly as I wanted it to act, and I wrote it because other software doesn't. So things You might dislike could be exactly what I wanted to have ;) My code and/or software on this page is free, but never was, is not and never will be freeware. Instead all is published under the terms of the 2-Clause BSD License.