vforv.net is the goddamn IP. ffs.

The owners won't assemble a list of allowed mods, so this community-maintained list will have to do.

• Xaero's Minimap (Fair-play Edition): the normal Xaero's Minimap with entity radar & cave view is not allowed. ^source
• Litematica: easy place is also permitted. ^source
• Shulker Box Tooltip ^source

Further notes:

• Any macro is permitted as long as it does not read the screen^source. This includes auto-clickers, sticky keys, etc.
• TNT duping is the only dupe that is allowed. ^source
• Chunk-loaders are allowed. ^source