The list of Dynamic DNS providers. Those allow you to point a DNS record to dynamic IP addresses. You may have a registered host like foo.bar.com and then point it to your dynamic IP address each time it changes.
Compare Brand24 vs Social Mention vs Sprout Social vs mention vs Google Alerts vs Sysomos vs Radian6
Compare different CRM with or without ERP extensions, SaaS (Cloud) or local install.
Compare Kindle Direct Publishing vs Lulu vs Smashwords vs Unibook