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iContact - This is what I use to capture and maintain my lists. Clients, Team Members, Hostesses, Prospects... They all go into this database. I have set up auto-responders to manage hostess coaching, new team member on-boarding, prospect follow up, you name it! I also use it for my customer and team newsletters. It is easy to use and I love the tracking and reporting features. They offer your first month for free to try it out, and the monthly plans are very reasonable and based on the size of your list. I have upgraded twice (which is very good news, it means my lists are GROWING and so is business!) If you sign up through this link http://icontact.extole.com/a/clk/2ZQWNS you and I BOTH get a $50 gift card!
MyeSig.com - I have a corporate subscription to myesig.com. This makes my emails look really professional, gives my contacts a way to instantly act on interest and I can track my "click-thrus" on their site.
SimplyBook.me - Allow team members and hostesses to book online, with real-time access to your current calendar. This integrates with Google calendars (and others)