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, invoicing, books, appointments, webinars, meetings, project management, helpdesk, ecommerce etc... It's a pretty robust platform (and for a one-person operation it's less than $500 a year)
I feel like the promise of Zoho One is strong, but when I was using it I found myself frequently frustrated with the way that most of the services seemed to range from slightly-to-dramatically worse than the competition. As soon as you start paying for a couple of alternatives because the Zoho versions are bad, the one-price-for-everything proposition becomes less appealing.
My roots are in engineering, and I agree wholeheartedly: zoho one is a no-brainer compared to having to cobble together solutions for standard business functions from a dozen vendors at triple the aggregate cost. Just the savings vs QBO or Xero makes it worthwhile.
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.
And project has Gantt charts (I clicked your link just to check that). I have always been disappointed by project/ticket apps that pretend to do project management but don't have a gantt view of tasks.
I don't work for them, I'm just a fan.