Original library in CPAN Excel::Template
I'm more than happy to hand over the repository. I needed just a small change, but there was no github repository to fork and the author seems on hiatus.
Excel::Template is a layout system to use the data structure from HTML::Template and create a Microsoft Excel file.
CAVEAT: All limitations stated in Spreadsheet::WriteExcel are in force, as that is the module used for rendering. If the XLS file is corrupted, I would first make sure you aren't doing anything that it says is bad.