Converter365.com is a universal online tool for the conversion of a multitude of different formats that is also completely free of charge. To find the format you need, you can search nine categories Image, Vector, Video, Audio, Documents, Archive, Spreadsheet, Presentation, and E-Book.
PlutoPDF - A URL to PDF converter wrapped behind a simple API.
File Converter - Convert & compress everything in 2 clicks!
Diff Checker - Diff Checker is a free online diff tool that quickly and easily gives you the text differences...
Smallpdf - PDF document management and conversion suite
RatherListen - Convert URLs, PDFs, & photos to clear spoken audio
CR2toGPGconverter - If you need to open, edit or print the images from your Canon DSLR that are in CR2 format, you’ll have to convert them in JPG or some more accessible image format.