Additions

Compass or Recovery Compass

Displays X/Y/Z coordinates.
X and Z will be colored green if the player is facing in the positive direction, or orange if the player is facing in the negative direction.
Displays what cardinal direction the player is facing in (N, S, E, or W).
Items with this behavior are determined by the cynic:debug_info/displays_location_and_direction item tag.

Displays X/Y/Z coordinates.
Displays the name of the biome you're currently in.
Items with this behavior are determined by the cynic:debug_info/displays_location_and_biome item tag.

Displays what day the world is currently on.
Displays how long it's been since the player has slept or died. The text is green if the player's last rest was less then 2 days ago, yellow if the last rest was longer than 2 days ago, and red if the last rest was longer than 3 days ago (when Phantoms begin to spawn).
If the player is within 64 blocks of a Villager, Clocks will display what action villagers are currently performing (sleeping, wandering, working, or gathering).
Items with this behavior are determined by the cynic:debug_info/displays_time item tag.
Clocks framed with Item Frames or Glow Item Frames will display their info when the player looks at them. For technical reasons, this behavior is hard-coded to Clocks, and cannot be changed or added to other items.

Display what the light level of the player's current location is.
Light source blocks include: Torches, Soul Torches, Redstone Torches, Lanterns, Soul Lanterns, Jack o' Lanterns, Candles (any color), Sea Pickles, Redstone Lamps, Glow Lichen, Froglights (any), Crying Obsidian, Sea Lanterns, Glowstone, Shroomlights, End Rods, and Light blocks (only obtainable in Creative Mode).
Items with this behavior are determined by the cynic:debug_info/displays_light_level item tag.