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install the package:
M-x package-install RET helm-mode-manager RET
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M-x helm-switch-major-mode
provides a list of all major modes. Hitting 'RET' enables the mode, C-z shows the mode documentation -
M-x helm-enable-minor-mode
provides a list of all inactive minor modes. Hitting 'RET' enables the mode, C-z shows the mode documentation -
M-x helm-disable-minor-mode
provides a list of all ACTIVE minor modes. Hitting 'RET' disables the mode, C-z shows the mode documentation