CenterMarker by Hubbs

Always-visible anchor: Places a crisp "+" at screen center; adjust size (1-256 px) and opacity (0-1).
Color control: Pick any color via swatch; changes apply instantly and persist.
Visibility modes: Show always, only in combat, only out of combat, only in instances, or only outside instances.
Marker style choice: Select +, x, dot (•), or asterisk (*).
Vertical offset: Shift the marker up/down from center with a numeric Y-offset (supports negatives).
Quick toggle: Enable/disable the marker without reloading UI.
Slash commands: /cm opens the panel; /cm size <px>, /cm alpha <0-1>, /cm toggle; /cm kb opens keybinds quickly; /cm cdm opens Cooldown Manager settings.
Auto combat logging: Toggle under Cool Stuff to start/stop /combatlog automatically in raids and Mythic+.
Healer mana tracker: Enable under Cool Stuff to show your party healer's mana percent in 5-player groups (uses UnitPowerPercent); drag the number to reposition.

Copy the CenterMarker folder into World of Warcraft/_retail_/Interface/AddOns/ or World of Warcraft/_beta/Interface/AddOns/.
In-game, enable CenterMarker, then /reload if needed.

Open settings: /cm
Set size via slider or number box.
Set alpha via slider or number box.
Pick a color from the swatch.
Choose marker style (+, x, •, *).
Choose when to show the marker: Always, In Combat, Not in Combat, In Instance, or Not in Instance.
Adjust feet Y-offset to nudge the marker vertically from center.
Open Quick Keybinds with /cm kb.
Open Cooldown Manager settings with /cm cdm.
Enable auto combat logging from the Cool Stuff tab if you want /combatlog handled automatically in group content.
Enable the healer mana tracker from Cool Stuff to see the healer's mana percent in 5-player groups; drag the display to move it.

Settings persist between sessions (CenterMarkerDB).
If the marker doesn't appear in combat, ensure "Show when: In Combat" is selected and the addon is enabled.
Auto combat logging defaults to on for raids and Mythic+, and can be toggled off in the config. Announces when it switches states.