If you are looking for a full professional grade video editor which is also free, Hit Film Express is your best bet. The only con of using this software is the one which is same for any professional grade software, that is, you will have to invest a considerable amount of time in learning it. On the scale of video editor learning process, this one falls on the harder side. However, if you are ready to invest your time, Hit Film Express can become the only editing software that you are ever going to need. It has everything that you will need to support your expanding editing skills. The editor supports almost every know video and audio format and has over 180 visual effects which you can use. The company also keeps a great selection of free tutorials which can get you started. However, as I said earlier, you will need to invest a considerable amount of time in learning this one. Also, the editor is a little heavy on the resources so you will need a good system to run it smoothly.
Openshot is entirely open source, which makes it one of the best video editing software that is accessible. It may remind some Mac users a little of iMovie with its easy to use drag and drop interface. However, Openshot packs more features than iMovie, including unlimited layers and audio mixing. This free editor strikes a nice balance between advanced features and a simple interface. It also allows real-time previews when you create transitions between clips.
As its interface is so clear, it lacks timeline, so you can't add filters and transitions. The whole design of Avidemux is that many functions are for practical use, not stylish purpose. If your needs is very basic, this free video editing software is a choice. For advanced video editing, it can't let you have more controls. The good thing is you can use it smoothly and learn it quicly if you are a new users in video editing industry.