I think Atlassian is a good example of what you are looking for. They certainly have sales people, but you can buy licenses on their website. Their product page

I think Atlassian is a good example of what you are looking for. They certainly have sales people, but you can buy licenses on their website. Their product pages seem designed to provide one with useful information instead of useless marketing babble. They provide free trials for their products that don't require that you talk to anyone. Their development process is quite transparent. They even provide source code to paying customers (again without having to contact them).