Managing multiple projects simultaneously?!?

Call me old fashioned, but I simplyuse different folders and the calendar + mail with different folders.

If you really need a good and powerful yet simple (read: easy to use) tool to manage your projects Omni Plan (https://www.omnigroup.com/omniplan/) is the way to go!

I'm a big fan of "real" project management software, like MS Project, which I've used for about 15 years or so, and I also use Merlin on the Mac. I have tried OmniPlan as it's aged but it's still too much of a incomplete toy for my needs. Project and Merlin take some getting used to, and they are to me dedicated resource (time/people/money) management programs.

I am, however, an owner and user of other OmniGroup software, and recommend giving OmniFocus/OmniFocus Pro a look. It's a hybrid GTD/project management/prioritization/resource management application - but without the Gantt charts and need for 2 years of experience before being a useful tool. There's demo at their web site.

If you need or want CRM capabilities, everyone I know swears by Daylight by Marketcircle. One of my friends bought a Mac just to use Daylight, and he lives in that app.

I guess I'm wondering how involved you want the software to be?

Usually, Wunderlist + Google Drive for collaborations to work well for most of my project. I like Wunderlist because you can add sub-tasks, due dates, add reminders, assign tasks, add notes, attachments, etc. It's not perfect but works pretty well. + it's multiplatform so it can sync across macs, iDevices, PC's, Android, etc.

And then Google Drive allows me to share docs w/ the team and people work on stuff together. When an assigned task gets crossed off the Wunderlist for a project, I know I can find related docs in Dive or even just check in on stuff as we go along. At the end, the group folder has all the work, various versions & final docs.