Here are some information about Linux systems.
If you use Linux, you need the .tar.gz file. This can be found at files.
You just have to extract it. Eventually you have to set the executable bit for the
htmlreplace binary.
The compressed file is stand-alone and contains the needed Qt libraries. If you want to know more about the source and programming, see the "Source" wikipage.
This program sould run on every bigger Linux distribution.
It was testen on Ubuntu 11.10 x32.
For Linux there is no installer available.