I run a couple of negative-profit social services aimed at my local communities:

• https://doctorpricer.co.nz: A website for comparing the prices of GP appointments in New Zealand. The price for a GP visit can vary dramatically even within the same suburb, so this tool is designed to help people find something which fits their budget.
• https://dunedinsound.com: An ongoing archive of gig media from gigs in Ōtepoti Dunedin. Important artistic moments are often lost to time, the idea here is to provide a permanent and reliable archive for photos, videos, and audio.

I have been running and maintaining both of these since 2014.

Sponsorship would help cover the cost of hosting these long-term, and the cost of maintenance.