Here are a few I found. Remember, Google is your friend
from the looks of it I would try the second one it seems more of what you are looking for
TL-PDB, Which means "True Love in PDB", is an easy-to-use, multi-function PC eBook maker.
The main features of TL-PDB are briefly described below to enhance your understanding of the product:
* Open, View, Edit, Save Convert PalmDoc / zTXT /TXT files in PC
* Convert and combine Text/HTML/PalmDoc/zTxt files to eBooks for Palm in batch work
* Integrated with Internet Explorer, support Accumulated Webpage Capture.
* Integrated with Windows Explorer. To convert/edit ebooks just need one right click .
* Support "Install to Palm" Function .
* Native Codepage Convertor, which support conversion bwteen GB/GBK/BIG5/SHIFT-JS
* Automatic text formatting , which can re-align paragraph, reduce line breaks etc.... It makes better view for ebooks.
* Multi-Language interface, Currently it supports English, Chinese Simplified and Chinese Traditional.
* Green Software, No Dlls, No Addons, Only one .exe file
Lastest Update : Firefox extenstion for TL-PDB (05/08/2005):
* reads PDB and PRC (Palm) files
* exports to PDF (doesn't require Adobe Acrobat to be installed), HTML, RTF (MS Word doesn't need to be installed), CHM, HLP, TXT (ANSI and Unicode), MS DOC (MS Word)
* supports batch conversion
* easy to use and easy to set up
* supports advanced PDF export options
* supports multiple CHM and HLP export options
* command line support, multiple language support, skin support
* bonus: converts books to RB (Rocket eBook), FB2 (FictionBook) and LIT (MS Reader) (since 2.01)