General repositories can be helpful for researchers looking to collaborate among institutions, or who want to maintain their scholarship independently (and without an institutional affiliation). Some options include Zenodo, Dryad, Figshare, and Humanities Commons.
Subject-specific repositories are an option if you want your work to be discoverable by a particular discipline. The Registry of Research Data Repositories is a great resource to explore options. You may also want to ask for recommendations from other researchers in your discipline, or check with your subject-specialist librarian.