I use n8n for workflows. It already comes with more than 200 ready-made integrations.
However, even n8n cannot do everything out of the box.
For this reason, I created two community nodes.
n8n-nodes-bluesky
This node lets you communicate with the Bluesky social media platform.

https://github.com/muench-dev/n8n-nodes-bluesky
n8n-nodes-capacities
I use this node to access the API of Capacities.

https://github.com/muench-dev/n8n-nodes-capacities
n8n-nodes-postgres
A few practical extensions, such as a "Row Exists" operation that can use the existing Postgres credentials of the core node.