Most computers come with a basic video editor: Windows is called Movie Maker; Mac is iMovie.
Free Editing Software for PCs
VideoPad Video Editor - Designed to be intuitive to use, VideoPad is fully featured video editing program for creating professional looking videos in minutes. Making movies has never been easier.
AVS Video Editor - Trim, cut, split, merge, rotate, mix videos. Apply effects and overlays, insert menus, audio, texts and subtitles. Burn DVD/Blu-ray discs.
Free Editing Software for Macs
Avidemux - Avidemux is a free video editor designed for simple cutting, filtering and encoding tasks.
Simple Video Splicer - SVS is a basic video editing tool for basic cropping and/or piecing together of video files.
The best editing software we know:
Final Cut Pro X - FinalCut Pro X is the latest iteration of Apples groundbreaking video editing software. While some experts feel it is a slightly softer version that its predecessors, it still allows an editor to produce aprofessional looking video. This requires the Mac OSX 10.6.8 or later opperating system.
Adobe's Premeire Elements 10 promisses expert level editing and is compatible both with Windows and Mac operating systems.