Chain related tools. Chain checkers, chain tools for breaking / making chains, chain whips.
The CT-6.3 chain tool from Park Tool is used for removing, installing and sizing chains used on derailleur equipment. Folds nice and small to allow carrying when cycling.
Lightweight chain tool - CT-5 - from Park Tool. Light enough to go anywhere - yet performs like a workshop tool.
The Park Tool plier type chain tool, aka the CT-2 is designed for fast, easy removal or repair of all chain types including 10 speed.
The CT-7 Chain Tool from Park Tool is specifically designed to work on the wide and tall 3/16"and 1/8" BMX/freestyle/Brompton wide chains now becoming popular.
The CT-3.2 is a heavy duty chain tool from Park Tool USA. Works on all derailleur chains including 10 and 11 speed plus 1/8" and 3/16" chains.
The Park Tool plier type master link chain tool makes removal of the master link easier.
To alleviate poor shifting and uneven drive train wear, most manufacturers recommend chain replacement at or before 1% stretch. The Park Tool CC-2 will help you check - and potentially save you money.
Check if your chain needs replacing BEFORE you wear out your cogs / sprockets with this chain wear indicator - CC-3.2 - from Park Tool!