Which keys are free / unmapped by default?

Question

Is there a list of keys which aren't mapped by default in vim?

Answer 1

Free Keys

Normal Mode

• <C-K>
• <C-_> (Same as <C-/>)
• <C-[> (Same as <Esc>)
• <C-@> (Same as <C-Space>)

Visual Mode

• <C-T>
• <C-K>
• <C-@> (Same as <C-Space>)
• <C-O>
• Q
• Z
• .
• <C-R>
• <C-_> (Same as <C-/>)
• <C-^>
• &
• <C-I> (This is the <Tab> key)

Insert Mode

• <C-_> (Same as <C-/>)
• <C-Z> (Unless insertmode is set)
• <C-B

Command-line Mode

• <C-@> (Same as <C-Space>)
• <C-O>
• <C-Z>
• <C-_> (Only active in default vim if allowrevins is set, for right-to-left languages)
• <C-X>

All Modes

• All function keys
• All ALT key combinations
• <C-S>

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Used source: https://vim.fandom.com/wiki/Unused_keys

This link points to a page listing unused keys in vim.

This page also lists keys that are synonyms of other keys in terms of functionality, meaning that these keys can be safely remapped.