Anyone who uses todo lists and wants to try a free computer based version then you could do worse than try www.todoist.com
. There is a paid for version but try the free version it is quite adequate then consider if you need the paid for version.
I have been using it for 4 months now and it has but one downside in that it isn't accessible if the internet is down. On the upside because it is internet based it is accessible from any computer. Just put your username and password in and there is all your data.
There is a slight learning curve but it works well and actually has quite a few functions when you delve deeper.