Currently, there are a few applications with content inaccessible for logged-out users.
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Here are some I know:
[ ] Nuance (except the Nuance console)
[ ] Almanac/Drydock objects (but not consoles and queries)
[ ] People badges, tasks, revisions, and commits
[ ] Diffusion repository management
[ ] User tasks, badges, revisions, and commits
[ ] Project members
[ ] Herald transcripts