diff --git a/README.md b/README.md
index 43e3a43..02d69ea 100644
--- a/README.md
+++ b/README.md
@@ -22,6 +22,7 @@ If you want to contribute, please read [this](CONTRIBUTING.md).
   * [Productivity](#productivity)
   * [Security tools](#security-tools)
   * [Simulation](#simulation)
+  * [Social networks](#social-networks)
   * [System tools](#system-tools)
   * [Task scheduling](#task-scheduling)
   * [Text editors](#text-editors)
@@ -321,6 +322,11 @@ See also [A comparison of operating systems written in Rust](https://github.com/
 
 * [hEngine](https://github.com/hashintel/hash/tree/main/packages/engine) - A Rust-implemented computational simulation engine, supporting large-scale agent-based modelling, with simulation logic written in JavaScript and Python.
 
+### Social networks
+
+* Mastodon
+  * [Rustodon](https://github.com/rustodon/rustodon) - A Mastodon-compatible, ActivityPub-speaking server in Rust
+
 ### System tools
 
 * [ajeetdsouza/zoxide](https://github.com/ajeetdsouza/zoxide/) — A fast alternative to `cd` that learns your habits [![release](https://github.com/ajeetdsouza/zoxide/workflows/.github/workflows/release.yml/badge.svg)](https://github.com/ajeetdsouza/zoxide/actions)
@@ -585,6 +591,7 @@ See also [Foreign Function Interface](https://doc.rust-lang.org/book/first-editi
   * [dgrunwald/rust-cpython](https://github.com/dgrunwald/rust-cpython) — Python bindings [![build badge](https://api.travis-ci.org/dgrunwald/rust-cpython.svg?branch=master)](https://travis-ci.org/dgrunwald/rust-cpython)
   * [getsentry/milksnake](https://github.com/getsentry/milksnake) — extension for python setuptools that allows you to distribute dynamic linked libraries in Python wheels in the most portable way imaginable.
   * [PyO3/PyO3](https://github.com/PyO3/PyO3) — Rust bindings for the Python interpreter [![build badge](https://api.travis-ci.org/PyO3/pyo3.svg?branch=master)](https://travis-ci.org/PyO3/pyo3)
+  * [RustPython](https://github.com/RustPython/RustPython) — A Python Interpreter written in Rust [![Build Status](https://github.com/RustPython/RustPython/workflows/CI/badge.svg)](https://github.com/RustPython/RustPython/actions?query=workflow%3ACI)
 * Ruby
   * [d-unseductable/ruru](https://github.com/d-unseductable/ruru) — native Ruby extensions written in Rust [![build badge](https://api.travis-ci.org/d-unseductable/ruru.svg?branch=master)](https://travis-ci.org/d-unseductable/ruru)
   * [danielpclark/rutie](https://github.com/danielpclark/rutie) — native Ruby extensions written in Rust and vice versa [![Build Status](https://api.travis-ci.org/danielpclark/rutie.svg?branch=master)](https://travis-ci.org/danielpclark/rutie)