In this tutorial, we will show you how to install RainLoop on a Debian 9 VPS. The tutorial will go over the required prerequisites, the installation of RainLoop, as well as the configuration of RainLoop itself. RainLoop is easy-to-install and set up, making it a quick installation. The installation process should take about 10 minutes if you follow the very easy steps described below.
RainLoop is a free and open-source webmail application written in PHP. As an alternative to other popular webmail applications like RoundCube and SquirrelMail, RainLoop is a complete webmail solution – it is a simple and modern, yet very powerful and flexible at the same time. RainLoop webmail has a built-in caching mechanism, which improves the overall performance of the application while also reducing the load on both the web server and the mail server.
Kafka or Apache Kafka is a distributed messaging system based on the principle of the pub-sub (publish-subscribe) model. It allows us to publish and subscribe to a stream of records that can be categorized. It is an incredibly fast, highly scalable, fault-tolerant system, and it’s designed to process large amounts of data in real time. Apache Kafka can be used as an alternative to a message broker as well, which allows us to process/transform a stream of records. Kafka can be used as a messaging system, but in a rather incomparably huge scale. Overall, Apache Kafka is a very powerful tool when used correctly.
Additionally, Open Web Analytics has built-in support for tracking websites that are created with popular content management systems, such as WordPress and MediaWiki.
TaskBoard is a free, open-source, PHP-based and self-hosted scheduling application which help users to keep track on their important tasks. TaskBoard has a simple and clean ‘Kanban’-inspired interface that’s intuitive and very easy-to-use.
The ISPConfig has four different levels of user access, which are as follows: Administrator, Reseller, Client, and Email-user. Each of these has varying levels of access to ISPConfig’s menus.
Gogs is a free and open-source self-hosted Git service written in the Go programming language. It’s easy-to-install, it’s cross-platform, and it’s lightweight, all of which allows Gogs to run on all sorts of hardware easily. This guide should work on other 
Shopware Community Edition (CE) is a free and open-source e-commerce application. As an alternative to another e-commerce application, like Magento, Shopware is a complete e-commerce solution – it is a very powerful and flexible application. Shopware is very easy-to-use, and you don’t need to master PHP in order to use it. The application is based on a number of symphony framework components developed in PhpStorm through the core features and its plugins.