Invoice Ninja - Invoice Ninja is a free, open-source solution for invoicing and billing customers.
GSMArena - GSMArena is an online site that offers exhaustive and up and coming cell phone data.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
NanoReview - Most advanced CPU and SoC comparison
GnuCash - A personal and small-business financial-accounting software, licensed under GNU/GPL and available for Linux, Windows, Mac OS X, BSD, and Solaris.
Productz.com - Crowdsourced products database