What software should I use for creating online training?

I advise you to record and edit on Windows, using Camtasia

I tried a bunch of other tools, but for Windows Camtasia is great. 

I also have Camtasia on the mac, but I don't use it for editing, I export to mp4 and edit on Windows. I think the editing on Mac doesn't flow as well. And I wish the two versions shared the same file format.

Apparently people also like screenflow on the mac, and I think if the Mac was my main machine I'd use that. But I'm sticking to camtasia on windows.

I have also used bbsoftware in my early days when Camtasia seemed too expensive, and it was good, but Camtasia was better - again evals for 30 days so you can experiment.

I have used sony vegas cheapy edition, and it too was good, but not really aimed at the screen capture and editing that I do for my training.