fitness & swimming class software

I am looking for a software, web based application and etc for my swimming class training company.
I do like because it allows me to create custom fields. However, it is too expensive to us.
Do you know others? Either .net or php is fine. Or any I can use to install into my IIS server will be even better.
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here's one but this is a somewhat niche field and my background is in CRM generally so I can't do more than offer the link.

google  "fitness class management open source" turned up a few alternatives
There is an app called Lark for mobile that measures your sleep /health that may assist you with monitoring the health of your customers. 
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