http://www.workrave.org/ http://www.workrave.org/ Works on Windows (XP or newer) and Linux. Free. Configurable time limits for micro/normal breaks, and a dail

http://www.workrave.org/ http://www.workrave.org/ Works on Windows (XP or newer) and Linux. Free. Configurable time limits for micro/normal breaks, and a daily limit. Flashes a popup when nearing the limit, then blanks your screen and starts the break timer. Option to postpone the break a limited number of times, or skip the break. Tracks your postpone/skip history and overall usage history so you can be disappointed in yourself for skipping breaks too often. Auto-detects when you have been away from the computer and counts that as break time.