I am using the same DVR sold by ******************* and a couple of other places. They are the same basic unit, but maybe different firmware. They don't have a brand name as far as I know. They are NOT an Angel Eye or Angel Eye knockoff (neither of which have sound).
I am using Windows Movie Maker which is no longer available from Microsoft. I am playing with Vegas Pro 14. I hate changing editing software. WMM does what I need, but when this computer is gone, so too is my editing ability with it so I will need to have a new program. You can poll the people here to find out what they are using. Each of the programs has advantages and disadvantages. They all do the same basic stuff, some do some really neat things, but the issue is how well you can learn to use it and how easy it is to use. I tried three different free download programs. None were intuitive and because they had so many options, were difficult to self teach. One was just overly complicated to do some of the things I use repeatedly in WMM. In short, I don't have a good suggestion for you, but I would suggest scanning YouTube for review and how-to videos. What doesn't work for me may seem easy peazy to you. The How-To vids can be very helpful.