Hi,
I’m the founder and sole developer of my own open source software called open3A. It’s a web-based invoicing application that I started in 2007 and have developed ever since.
I initially developed open3A because I needed it myself to write invoices to my customers. When it was working I just put it out there in the internet because I thought someone else might find it useful. It was one of the first (maybe the first, idk) web-based solutions in this area after all.
In fact someone found it useful and asked if I could add some features. I was still in the university and did it for free because I didn’t think much of it. After a while he wanted to pay me money for my work and why should I have declined?
Then others came and asked for more features which I implemented. Sometimes payed, sometimes free…
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