It’s a senecio serpens in desperate need of more light.

I believe it is in the aloe family.

Check out some of the species in the genus from the included link below. Click on each species names for further information. Best wishes! https://www.smgrowers.com/products/plants/plantdisplay.asp?plant_id=3502

Without flowers to help narrow down, I’m guessing this might be a cultivar in the Senecio genus, possible Senecio mandraliscae (?). When it flowers and you still don’t know make new post with photo of flowers. https://commons.wikimedia.org/wiki/File:Starr_070906-8762_Senecio_mandraliscae.jpg