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Froged - One click solution providing easy-to-use marketing, sales and support services to turn website visitors into happy customers.
Invoice Ninja - Invoice Ninja is a free, open-source solution for invoicing and billing customers.
Intercom on Customer Engagement - A book on how to create messages that drive engagement
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Keep Your Friends Close - A free e-book about maximizing Customer Lifetime Value
GnuCash - A personal and small-business financial-accounting software, licensed under GNU/GPL and available for Linux, Windows, Mac OS X, BSD, and Solaris.