MyClientBase is described as 'was the predecesor of FusionInvoice, you can find the new application here on AltTO at: FusionInvoice' and is an app in the Business & Commerce category. There are three alternatives to MyClientBase for Online / Web-based and Self-Hosted solutions. The best alternative is Siwapp, which is both free and Open Source. Other great apps like MyClientBase are Bahaquote (Paid) and Angular Invoicing (Free, Open Source).
Bahaquote is leading Service Provider of Free Online Billing Software and Estimate software at affordable prices. The best part is we can customize the system in 24 hours, so that it is built around your business' particular needs.