I've built a CRM (https://www.bizzey.com) for myself to automate my accounting / business administration. I was freelancing on the side and noticed that many of the business solutions where either crazy expensive for a single person business or looked like they were made in the 80's.
It has since exploded into fully fledged CRM with all kinds of features you can choose from. I originally built it for myself to keep track of everything expenses, recurring invoices, ... At some point a freelancer saw me working in it and asked what I was using.
Told him what I was working on and he became my first customer, since then it has spread through word of mouth.
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