Regarding the second plugin, I couldn't find a good official screenshot, I guess the feature is not well advertised. So here is how the panel looks like, after aggregating all your TODOs from all your notes. The syntax is the same as in the Inline TODO. Ticking the tasks on the panel will update the TODO in the note where you originally wrote it.
If you like Todo.txt, also check out the Metis Plugin.
Today's TODOs:
Future TODOs:
