Laza is described as 'Online billing software to simplify your business. Invoicing, subscriptions (reoccurring invoices), purchase orders, online payments, customer management, product management, multiple company identities, reporting and white label service'. There are more than 10 alternatives to Laza, not only websites but also apps for a variety of platforms, including Windows, Android, iPhone and Android Tablet. The best alternative is Odoo, which is both free and Open Source. Other great sites and apps similar to Laza are FreshBooks (Paid), insightly (Freemium), Intuit QuickBooks (Paid) and Teamleader (Paid).
Odoo (formerly OpenERP) is a suite of open-source business apps written in Python and distributed under the AGPL license, under the Open Core software business model. It is used by 2 million users worldwide to manage companies of all size.
Send, track and collect payments quickly. Great for teams, freelancers and service providers. FreshBooks is an easy cloud accounting app for small businesses and freelancers, specifically designed to save you time billing clients.
InvoiceTrackr is software as a service that enables you to input your customers, products and services. You can then create billable line items by time or unit and create pdf invoices based on tracked products and/or services.
Naologic is an end-to-end business management solution that allows service providers to manage their teams, finances, and integrate products. We help companies build a data-driven culture and connect with customers, partners, and employees in entirely new ways.