> Gershwin is a desktop environment based on GNUstep welcoming to switchers.

Might be just me, but that feels like an odd description. Assuming I'm understanding the intent correctly, perhaps something like

> Gershwin is a desktop environment based on GNUstep but made more intuitive for users coming from other desktops

might be easier to understand?

It's a reference to https://en.wikipedia.org/wiki/Switch_(advertising_campaign)