In this tutorial, we will show you how to set up a mail server with PostfixAdmin on a Debian 9 VPS. We will configure a mail server with Postfix, Dovecot, and MariaDB.
PostfixAdmin is a web based GUI to the database that is used by Postfix. You can easily manage your mail server, like adding and removing domains, email accounts, aliases, and quotas through the use of Postfixadmin. The web-based GUI makes these functions and features more accessible, and allows you to change and access information while away from your terminal. Let’s get started.
OwnCloud
Without a dedicated IT department, running an online store or managing a company website can be extremely difficult. If you do not have the resources to build an in-house team, soon enough you will have to think about hiring help. That is when you will come across options such as single-tenant hosting, 
WonderCMS is a free, open-source, and database-free flat-file content management system written in PHP and jQuery. It is a simple, fast, responsive CMS that allows you to create websites without the need of a separate database. WonderCMS comes with a rich set of features, including WYSIWYG (What You See Is What You Get) support, SEO friendly, friendly URLs, a simple click and edit functionality, easy to theme, custom login URL, and lots more. Let’s get started with the installation.
Apache Cassandra is a free and open-source distributed NoSQL database management system that provides High-Availability with no single point of failure. Cassandra does not use the table model seen in MySQL, MSSQL or PostgreSQL – rather, it uses a cluster model. It is designed to handle large amounts of data across commodity hardware. It provides linear scalability by adding a new machine to it without any interruption to applications. Apache Cassandra is used by many popular organizations including Apple, NetFlix, eBay, and Easou.
Grav is an open-source, fast, and flexible flat-file CMS (or Content Management System) based on and written in PHP. Grav uses a flat-file database for both its back-end and front-end. The main focus is on speed and simplicity instead of on integrated built-in features, which would increase the complexity of the application.
Anaconda is one of the most popular package managers and distribution systems for the Python and R programming languages. It is open-source and designed for data science and machine learning platforms, and is used for large-scale data processing, deep learning-related applications, and scientific computing.
Kanboard is a free and open-source project management software that helps you to manage your projects simply and efficiently. With Kanboard, you can visualize your work, limit and pace yourself with the work in progress, and drag and drop tasks to manage your projects easily. Kanboard also provides support for reports, analytics, and it can be integrated with external services. Kanboard allows you to customize your board according to your business needs, making it a very versatile tool that can boost the productivity of any business.