docs: Add Torizon to related projects and OS

The Torizon platform, includin the TorizonCore OS, the TorizonCore
Builder Tool and the Torizon OTA, use OSTree as a base for update the
host OS, while the user focus on application development using Docker.

Add TorizonCore to the list of Operating systems and distributions using
OSTree.

Add Torizon and its components to the list of related projects.

diff --git a/docs/index.md b/docs/index.md
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--- a/docs/index.md
+++ b/docs/index.md
@@ -65,6 +65,10 @@ system for GNOME.
 [Liri OS](https://liri.io/download/silverblue/) has the option to install
 their distribution using ostree.
 
+[TorizonCore](https://developer.toradex.com/knowledge-base/torizoncore-overview)
+uses libostree and Aktualizr as the base for OTA updates from compatible
+platforms, including [Torizon OTA](https://developer.toradex.com/knowledge-base/torizon-update-system).
+
 ## Distribution build tools
 
 [meta-updater](https://github.com/advancedtelematic/meta-updater) is

diff --git a/docs/related-projects.md b/docs/related-projects.md
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--- a/docs/related-projects.md
+++ b/docs/related-projects.md
@@ -362,5 +362,32 @@ The [Balena](https://github.com/resin-os/balena) project forks Docker and aims
 to even use Docker/OCI format for the root filesystem, and adds wire deltas
 using librsync.  See also [discussion on  libostree-list](https://mail.gnome.org/archives/ostree-list/2017-December/msg00002.html).
 
+## Torizon Platform
+
+[Torizon](https://www.toradex.com/operating-systems/torizon) is an open-source
+software platform that simplifies the development and maintenance of embedded
+Linux software. It is designed to be used out-of-the-box on devices requiring
+high reliability, allowing you to focus on your application and not on building
+and maintaining the operating system.
+
+### TorizonCore
+
+The platform OS - [TorizonCore](https://developer.toradex.com/knowledge-base/torizoncore-overview) -
+is a minimal OS with a Docker runtime and libostree + Aktualizr. The main goal
+of this system is to allow application developers to use containers, while the
+maintainers of TorizonCore focus on the base system updates.
+
+### TorizonCore Builder
+
+Since the TorizonCore OS is meant as a binary distribution, OS customization is
+made easier with [TorizonCore Builder](https://developer.toradex.com/knowledge-base/torizoncore-builder-tool),
+as the tool abstracts the handling of OSTree concepts from the final users.
+
+### Torizon OTA
+
+[Torizon OTA](https://developer.toradex.com/knowledge-base/torizon-update-system)
+is a hosted OTA update system that provides OS updates to TorizonCore using
+OSTree and Aktualizr.
+
 ###### Licensing for this document:
 `SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later)`