InspireIP is a cool idea management software that I found quite user-friendly. Simple to track the status of your ideas - whether management reviewed them or not, if yes - their comments, etc. Net-net, cool stuff.
Best part - It is not limited to technical ideas (i.e. for filing patents only). It is equally useful and impactful for non-technical ideas. As an example, we got certain new things in our office workspace by sharing our ideas on InspireIP.