Nextcloud is a set of programs for creating and using cloud storage.

The service allows you to share and work on documents together, send and receive e-mail, manage your calendar and communicate in video chats without data leaks.

The main advantage of Nextcloud is its ability to increase team productivity through a simple user interface on mobile devices, the Internet and on the computer, as well as powerful integrated document collaboration and communication capabilities.

Available are real-time notifications of new shared content or comments, built-in file sharing tools that are compatible with Microsoft Office, a seamless transition to chat and audio/video calls, and a wide range of productivity tools for handling mail, meetings, tasks and more.

The admin panel allows you to manage users and groups. The administrator can always open or close access to uploaded files for individual users or groups.  

Features of the service:

• modern and easy to use intuitive interface;
• real-time collaboration and instant access to all data from any device anywhere;
• powerful encryption capabilities and built-in file access control.

Nextcloud is an open-source content collaboration platform that provides enterprise support when needed. It is designed to offer best-in-class productivity and is developed at an impressive pace with new functionality becoming available every few months. Nextcloud Groupware integrates Calendar, Contacts, Mail, and other productivity features to help teams get their work done faster, easier, and on their terms. Nextcloud Office is a powerful LibreOffice-based online office suite with collaborative editing, which supports all major document, spreadsheet, and presentation file formats and works in all modern browsers.

Nextcloud scales from a Raspberry Pi with 2 users to globally distributed installations with tens of millions of users at major hosting providers. It enables productivity across any platform, whether in the office or on the road, to share, collaborate, and communicate across organizational boundaries. Nextcloud provides transparent access to data on any storage, protects, controls, and monitors data and communication across your company, and guarantees compliance with business and legal requirements.

Some of the features of Nextcloud include Video Verification, which enforces a Nextcloud Talk video call before access is given to a share, making sure the identity of the recipient is properly checked. The call can be picked up through the Nextcloud Talk Mobile apps as well as the web interface.
Nextcloud can be installed on an Ubuntu server, and tutorials are available to help with the installation process. The Nextcloud admin manual provides guidance on Apache Configuration and enabling SSL.

In summary, Nextcloud is a self-hosted collaboration platform designed to empower productivity and collaboration, with features such as Groupware and Office, and the ability to scale from small to large installations