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.
Visily - The easiest and most powerful wireframe software for agile teams.
File Converter - Convert & compress everything in 2 clicks!
PSD to Sketch Design Converter - Convert a Photoshop design to a layered Sketch file for free
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.
Zeplin - Collaboration app for UI designers & frontend developers
AIFFconverter - Convert AIFF to MP3 format online for free. AIFFconverter.com is the best online tool around is that it’s completely free for unlimited daily conversions per user.