FileConverter.digital - File Converter allows unlimited free conversions. Currently most commonly used to perform video conversions such as webm to gif, gif conversions.
Visily - The easiest and most powerful wireframe software for agile teams.
Magicul.io - Convert between Adobe XD, Figma, PDF, Illustrator, Sketch and more with 1 click
Handoff by Marvel - Automatically turn designs into assets, specs and code
ConvertOnMac - ConvertOnMac is the best free online converter for every Mac user that supports more than 500 different file formats.
Zeplin - Collaboration app for UI designers & frontend developers