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Nextcloud is an open source cloud collaboration platform, forked from ownCloud, written in PHP.

PHP is a scripting language for creating websites.

JavaScript is a lightweight, object-oriented, cross-platform scripting language, often used within web pages.

OpenBSD httpd is a HTTP server embedded in the OpenBSD operating system.

OpenBSD is an open-source Unix-like operating system derived from the Berkeley Software Distribution (BSD).

Hetzner is a German web hosting provider.

Hetzner is a German web hosting provider.

Gandi is a French internet services provider owned by Your.Online.

Gmail is the email service provided by Google.

The SSL certificate is invalid because it is not issued for the domain where it is used.

External Cascading Style Sheets define style rules in a separate CSS file.

Embedded Cascading Style Sheets define a set of style rules in a <style> element within a web page.

Inline Cascading Style Sheets define style rules directly within an (X)HTML element using the style attribute.

HTTP Strict Transport Security (HSTS) defines a mechanism enabling web sites to declare themselves accessible only via secure connections.

The websites redirects visitors to use SSL encryption, e.g. from http://example.com/ to https://example.com/.

The Open Graph protocol, originally developed by Facebook, is an RDFa-based format that enables any web page to become a rich object in a social graph.

HTML5 is the fifth revision of the HTML standard.

UTF-8 (8-bit Unicode Transformation Format) is a variable-length character encoding for Unicode, which is backwards compatible with ASCII.

Scalable Vector Graphics (SVG) is an XML-based vector image format.

GIF (Graphics Interchange Format) is a lossless compression image format, originally introduced by CompuServe and suitable to store graphics, logos and simple animations.

Commercial entities