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Invois Online
InvoisOnline is an online invoicing system for individuals and small businesses—let them create quotes, invoices, and PDF downloads, manage customers, accept FPX payments, and track income via a dashboard.
Site24x7 can monitor availability of your servers, websites and applications. It can also alert you when downtime is detected. You can check the status of your website - 24x7 from anywhere (even if you aren't connected to the internet).