EVEMon is a lightweight, easy-to-use standalone Windows application designed to assist you in keeping track of your EVE Online character progression.
You can view your current skills and attributes, what you're currently training, and your ISK balance.
EVEMon can track multiple characters across multiple accounts, so all your alts can be monitored through the same, simple interface.
You can also plan your future character progression, by setting up a skill training plan; or even just play "what if" with detailed listings of all skills and training times.