It's way overkill probably but JIRA has a JQL language that allows you easily apply filters to your Kanban board which I use every day to know what to bring up in my standup. I just have a "recently updated" filter that looks at all user stories/bugs/sub tasks and shows them to me. Again JIRA is a heavy tool if all you want is "todo list" but it's the best product management tool I've come across and for < 10 users it's only $10/yr if you host it yourself.
It also has a number of agile features via the official "JIRA Agile" plugin.