[Kevin Crenshaw]

TaskMerlin is hierarchical task, project, and note outliner with a lot of attention to detail. It supports a fair amount of customization and support valuable features like a Sort Designer and highly-flexible filtering.

GTD and TRO with TaskMerlin

TaskMerlin does GTD and Total, Relaxed Organization.

You can create persistent filtered views for Unprocessed Tasks, Weekly Review, etc. using the Sort Designer.

Multiple tagging is possible by entering comma-separated values in the tag string, then saving filtering criteria for instant access later. Name your tags carefully to ovoid overlapping names and false matches. (Ex.: you can enter "Errands, (Work), Calls" as a tag string and search for "Errands" to find all tasks with "Errands" anywhere in the tag strings.)

[Andrew Macdonald]

Thanks for the review, Kevin!

[Editor's note: in the initial review, we stated that TaskMerlin is missing fast or persistent, saved filtering by context and/or tag. This was incorrect. Andrew Macdonald's excellent reply follows.]

In TaskMerlin, you can create filters based on the context or tag (or any field combination) and save them in the Filters pane. They can then be clicked on at any time to give that custom view. There's also a Filters toolbar button to apply the current filter to any project or folder you subsequently click on.

Thanks for your reply. I created an example filter based on the context, called "Home or Office":
http://www.taskmerlin.com/images/screenshots/context_filter_create.png
 
That filter subsequently appears in the Filters pane (lower-left), and can be clicked on. The items that meet that criteria then appear in the Task Grid (upper-right), and can be edited.
http://www.taskmerlin.com/images/screenshots/context_filter_select.png
http://www.taskmerlin.com/images/screenshots/context_filter_taskgrid.png
 
Also, clicking on the right-most Filters pane toolbar button causes the current filter to persist when the user subsequently clicks on items in the Folders pane (top-left), in this case the Inbox folder.
http://www.taskmerlin.com/images/screenshots/context_filter_persist.png


Thanks,
Andrew Macdonald
http://www.taskmerlin.com/