I'm planning to open a small gym and am looking for management software. I don't want cloud services or a subscription fee. I use Linux in my personal life and would prefer to keep running that at the business. Does anyone have experience with this type of thing?
I plan to self host all my services and data if possible such as camera systems and maybe even the website (I found a great local website company I'll be talking with soon).
I have been using Odoo for years to generate invoices for my little IT business. I don't use any features that cost money. I am working a web store for my wife and have been playing with erpnext.
It is written in Python / Javascript and can be installed on your own servers.
I has a lot of features that cost in Odoo but are free and looks like it is easer to modify.