Step-by-step on how to edit avi movie files on mac without iMovie.
Step1: Import
To begin working, you need to download and run this Mac AVI Editor. Drag AVI videos to the resource pane for importing.
Step2: Edit AVI Files on Mac
And then drag AVI videos to the timeline pane for editing. On it, you can split, merge, split, copy video clips based on your need.

Step3: Share edited AVI video
This Mac AVI editor has many sharing options which meet your every need.
Learn more information about AVI Editor Mac - How to edit AVI videos on Mac.