Here you can find many FOSS utilities: https://github.com/serhii-londar/open-source-mac-os-apps Also, check r/apphookup on reddit for discounts (every day there’s a couple iOS apps that are made free and they’re often compatible with the Mac too thanks to Catalyst). If you have an iPhone you can use the Pager app and set monitors for the subreddit to receive notifications.

Eventually you can pay for a SetApp subscription (10 whatever your value is + 3 for any additional device).