Open Source PHP Billing Software

Invoice Ninja is a free and open source invoicing, expenses and time-tracking app built with Laravel and Flutter. It offers a plethora of great features, including custom branded invoice design, recurring invoicing and auto-bill clients, real-time quote creation and custom proposals, expense reporting and so much more! Invoice Ninja is also capable of handling online payments from more than 40 payment gateways, including Stripe, PayPal and WePay. It also accepts payments using credit cards, ACH, Bitcoin and more. Get paid online, organize project workflows with Kanban Boards, and track time online via your Webapp account all with Invoice Ninja.

Crater is an open-source web & mobile invoicing app made especially for freelancers and small businesses. It's the complete invoicing solution you need, allowing you to track expenses and payments, calculate taxes, and create estimates and invoices. As both a web and a mobile app, Crater allows you to manage your invoices and keep track of everything even on the go. Crater's web application is made with Laravel & VueJS, while the mobile apps are built using React Native. Crater is a completely free and open source professional invoicing solution. Make the smart choice for managing your budding business's transactions with Crater.

Keeps track of times entry and expenses reports of employees and contractors by projects and accounts, automatically generates invoices with details. You can print weekly time cards and expense reports by employee, project, and account. It allows you to review and approve times & expenses before generating invoices. This application is ideal for who bills their clients by time and material basis, such as IT consultants, Lawyers, CPAs, Government Contractors etc. Full featured demo site: http://tems.sourceforge.net Play with it from your browser to find out if it will fulfill your requirements, before downloading it.

FreeTemplateOffice is the fastest way to create great-looking office documents like business letters and invoices directly online and download them instantly. No login or account creation required. No word processor needed. Free of costs.

A simple but very useful script for everyone. Here you can store your daily expenses, by following few steps. By default system displays 1 month expenses on main screen. But there is search option available to display previous months expenses detail. DEMO: http://expense.adminspoint.com/ Demo Login: dexpenseman@gmail.com Demo Pass: dexpensepass For Installation check installation wiki here: https://sourceforge.net/p/daily-expense-manager/wiki/Installtion/

LinxBooks – Have faith and carry on. Overview LinxBook is a simple and easy-to-use business accounting application. Linxbooks includes basic features that help the businesses create invoices, quotations, manage payments, payrolls, contracts and expenses Download at GitHub: https://github.com/LinxHQ/linxbooks Demo is at: http://linxbooks.com/demo (user: admin, password: admin123)

Mutasyon is write with PHP, Smarty, HTML, CSS and JQuery. We can create customer, invoice and products with it and tracking money which input or output. Mutasyon can; 1) Add customer, 2) Create invoice, 3) Add product and product images, 4) See invoice detail and print invoice 5) See product detail, amount, price, tax and profit 6) See money input and output history. And its support multi language and template. Note! Please if you see any problem tell me. Thanks