To increase communication with my students and parents or guardians, I use Remind.com. It is like Facebook Messanger for Education. Students login with Google and they have a platform where I send out reminders that go out via SMS, iOS or Android apps, email, or desktop notifications. I also have student to teacher communication capability if students have questions or I need to tell a student something. Very easy to use and setup as well.
Within my math department we share all our curriculum with Dropbox. Just like Google Drive you sync across many devices and store locally on your own computer. When my colleagues create new documents in our shared folders, they are automatically synced to my own so I can see what they made as soon as they save it.
Also if you add friends or colleagues with a special from Dropbox, you can get free space increases of 2 GB for each person you add. I added my wife and family
I have just now started to use Twitter this year. I find it very useful in connecting with other educators to find out what others are doing with technology in education. I also use it to keep our community up to date with the soccer team I coach. Easy to search for relevant and current news locally as well
I can't avoid Office. It's probably one of the most used by educators with Word and Excel. I use it all the time to create worksheets, tests and for compiling data. I just don't put it at the top because it's not really knew to anyone unless you're from the Stone Age or a small island in Papa New Guinea.
Also Teachers get Office 365 for free. Just sign up at their site with your education email.
When I am looking for inspiration or ideas, I often turn to Pinterest. There is a never ending abyss full of ideas for just about anything in life. Everything from graphics to links to blogs where teachers are creating. You don't always have to create something brand new. Find something someone else did and make it work for you