Toobox

Doxillion Document Converter
A free tool for converting documents to and from most file formats. It can convert DOC, DOCX, HTML, PDF RTF, TXT, and WPD documents into DOC, DOCX, HTML, PDF, RTF, and TXT files. It integrates with right-click menus in Internet Explorer and also supports drag and drop. It can also be used to repair corrupted documents as it converts them.

Zamzar File Converter
Zamzar is a free online converter for any file up to 100 MB in size and no download is required. It converts between many document, image, video, archive, audio, and CAD formats. Zamzar converts TXT files to MP3 format, providing a high quality, online text-to-speech service.