> For the complete documentation index, see [llms.txt](https://www.build3.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.build3.network/developers/notes-about-substrate/other-important-crates.md).

# Other Important Crates

Once you have a conceptual understanding of runtime and the FRAME pallet system, there are three other important Crates that come with the subtrate\_ framework.

{% content-ref url="/pages/tZ6XyQYrvC2DsNfXSEuP" %}
[frame\_system](/developers/notes-about-substrate/other-important-crates/frame_system.md)
{% endcontent-ref %}

{% content-ref url="/pages/V53j1tNX5m1yB9EwqclI" %}
[frame\_support](/developers/notes-about-substrate/other-important-crates/frame_support.md)
{% endcontent-ref %}

{% content-ref url="/pages/DLtxzkM7tm7XU1ndtxcd" %}
[frame\_executive](/developers/notes-about-substrate/other-important-crates/frame_executive.md)
{% endcontent-ref %}