Datapacks:

• disable_endermen_grief (Endermen can't pick up blocks)
• universal_dyeing (Adds dye-related recipes, like for hardened clay)
• sleep (One player sleep, you can wake up people via clicking the chat msg) (not working in 1.15)
• multiplayer_sleep (one player sleep) (Works in 1.15)
• afk_detect (Detects afk ppl, changes color and stops lifetime & timeplayed)
• slow_tick (Internal datapack, runs the 1 sec and 5 sec clock)
• disable_cod (All cod is teleported to the void every 5s, their TPS impact was huge)
• disable_bats (All bats are teleported to the void every 5s)
• fast_netherrack (Netherrack items despawn in 5-10 seconds)
• scoreboards (Scoreboard cycle & triggers, read more bellow)
• fast_stone [disabled] (Stone & cobble despawns in 5-10 seconds)
• spectator (Spectator gamemode for everyone)
• tools (Random tools: entity counter, tps display, unicorn (read more bellow), better clock)
• better_mending (Drops xp while standing on an anvil, allowing mending with your own xp. Player must be minimum lvl 6)

Commands:

All of the trigger commands are in the form of /trigger .<name> (defaults to value 1)
When a number means something you'll need to use /trigger .<name> set [num]

Scoreboard

• Toggle the scoreboard cycle: .SbCycle
• Set a specific scoreboard: .StatName will set the StatName scoreboard (eg: .Deaths)
• Clear the sidebar: .clear
• Change the player colors: .color set [num], color codes can be looked up here

Tps & Entity counter

To show & update the debug scoreboard for N seconds: .Debug set [seconds] (max: 60).
Don't trust first second result, always set it for a few secs.
You should disable the sb cycle, or debug sb will get overridden every 5s by the cycle.

The player-specific entity counter can be triggered via /function tools:entity_count (OP only)

Unicorn

The .Unicorn trigger will toggle the horn, accepted values:

1. end_rod
2. button
3. glass
4. lead

Spectator

To toggle between survival and spectator you can use the .Spectator trigger, when leaving spectator mode you will be placed where you entered spectator mode. It will only allow you to go into spectator if you are not taking damage/falling/drowning