We've been using Staff Squared over the past month and it's extremely useful to keep on top of holidays, sickness, personal details, contact info and more. It does some cool stuff like not letting too many people take holidays at the same time (which can be customised).
HRMS refers to a suite of software that organizations use to manage internal HR functions. Also called a human resources information system (HRIS), HRMS systems put information about a company's most valuable assets in front of the people who need them.
Simple HR Software