Open Source Point of Sale is a web based point of sale application written in PHP using CodeIgniter framework. It uses MySQL as the data back end and has a Bootstrap 3 based user interface. If you like this project, please give it a star! Doing so helps maintain Popular OSS status for the project.
SuiteCRM - Open source CRM for the world
Dolibarr ERP CRM is a modern software package to manage your company or foundation's activity (contacts, suppliers, invoices, orders, stocks, agenda, accounting, ...). it's an open source Web application (written in PHP) designed for businesses of any sizes, foundations and freelancers.
Kimai is the #1 open-source time-tracking application. From freelancers to companies and organisations - everyone can manage timesheets, generate reports, create invoices and so much more... Web-based multi-user application, available as On-Premise or SaaS version: https://www.kimai.org
Kanban project management software
:notebook: eLabFTW is the most popular open source electronic lab notebook for research labs.
《一人企业方法论》第二版,也适合做其他副业(比如自媒体、电商、数字商品)的非技术人群。