> For the complete documentation index, see [llms.txt](https://zerodensitydocumentation.gitbook.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://zerodensitydocumentation.gitbook.io/docs/reality-5.3-sp2/reality-5.3-sp2/developers-guide.md).

# Developers Guide

Reality Hub integrates the Reality world with external data sources such as **weather**, **finance**, **elections**, and **sports**. 

Powered by the **web-based dynamic user interface** and **highly customizable tools**, Reality Hub allows you to **define rules for your data**, **organize** the data sources and **customize** them to match your design.

The Developers Guide has the following sections:

{% content-ref url="/pages/5HNfQmATzZ3NmOMwfTSF" %}
[Reality Hub Open-Source SDK](/docs/reality-5.3-sp2/reality-5.3-sp2/developers-guide/reality-hub-open-source-sdk.md)
{% endcontent-ref %}

{% content-ref url="/pages/gF0C3MCr5HzkEsRT8ELj" %}
[REST API](/docs/reality-5.3-sp2/reality-5.3-sp2/developers-guide/rest-api.md)
{% endcontent-ref %}