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Checked issues page and not found an response from their dev in the first page, to me it's inactive.

I wandered to this software awhile ago but then moved immediately to Lucidchart.com then Draw.io

The company that make it is Vietnamese I think. They do some paid software too, and it looks like pencil is what the developer does when he has time. So I think the project is active, but not very active.

Seemed active only last summer: https://github.com/evolus/pencil/graphs/contributors

I guess they abandoned it after that then. May be someone will pick it up soon.