Handbrake is a tool for Mac and PC to convert video from nearly any format to a selection of modern, widely supported codecs
Wonderfox is free DVD ripping software that helps you backup a DVD to a hard drive
AVC Free Any Video Converter takes videos from your computer or downloaded from the Internet and converts them into any format you'd like.
Most people are fine with Windows Movie Maker or iMovie for editing their videos, but what if you want to go with something more extensively featured? Well here's a short list of pro-quality video editing tools that can be downloaded for free:
Shotcut supports up to 4K UHD video and has a variety of video and audio filters and editing tools
DaVinci Resolve - Timeline editing, colour correction and support for multicam sequences.
Blender - Mainly a CGI package, but also has a timeline editor built in, so you could edit the video and add some computer generated and animated overlays.
Lightworks has been used to edit films such as: LA Confidential, Pulp Fiction, Heat, Road to Perdition, Hugo, The King’s Speech and many more.
Warning: Because these are professional tools they make take many hours of learning and require higher PC specs than your average home computer, but if you want to move to the next level then they're worth checking out.