I'm not a dev, so some of the dev specific tools I can't speak to, but after looking through this list, for biz admin I suggest looking at Zoho One -- it literally has 90 percent of the tools already and they're integrated, for one price per user. It's been incredible for me as a freelancer to have one place and one price for all my needs: docs, mail, social, email campaigns, transactional email, website, crm, invoic…
Hi, I'm the author of this post. We prefer to choose tools for a function by daily users than choose an all-in-one suite. One reason is our team is small, so this way is affordable, also we trust the best tool for a function is 10x better than the one of the all-in-one suite. Second, integrating those tools is not a hard thing.