What apps do you use that help you perform better in your business?

I use Microsoft Office 365 for Business for all my management of customers, calendars, mail, as well as backup to the cloud (OneDrive for Business).

This is how I set up local businesses when possible. https://afflnk.microsoft.com/c...

Depends. What aspects of business are feeling 'old' and need to be refreshed? 

Google Apps is the killer app for me.

That is a very broad question...the first question to ask is what is not working or could be improved.  Next question what be what is important to the business.  Both of these questions get to the core of where to focus your attention. I am ok with qualititve brainstorming, but would be helpful to apppy some metrics so that you can quantify your issues and return on investment of time and money.  So in short, don’t focus on the solution first, focus on the problem/opportunity.  

Aweber for email automation, Hootsuite for social media posts and lots of others depending upon the use.

My main software is AutoCAD and CADWorx 3D for building models of process skids, gas processing plants, etc. Also us all the MicroSoft Office products. 

Apps on the iPhone, I use Theodolite as a GPS camera, various pipe fitting apps, Deflection for beams, Time Mastr for time keeping, Flir for inferred camera, and about 20 other apps

I suggest Google Apps for the majority of what you'll need on a day to day basis.  Google Keep is great for keeping tasks lists to help you keep on track. 

Outside of those apps it really depends on what your business does what other apps might be available out there to help you make your life easier and save some money. 

We use Slack and Hubspot all day every day!

There are a vast number of useful applications for business:

Microsoft Office 365 is the bare minimum to conduct everyday business with the included products of Excel ( spreadsheets and data analysis ), Word ( documents and publishing ), Outlook ( robust hosted email client ), OneDrive ( cloud storage - up to 1TB with an Office365 subscription ), Skype ( calling, chatting, and video ), Powerpoint ( presentations ), Access ( database and sql tool for non-programmers ). 

Then there is Freshbooks or Quickbooks for basic accounting. Expensify for expense and receipt management. 

Slack for team organization and communication and sharing. Asana is also great for team communication and project management.

Square allows everyone to accept credit cards with a simple rate plan. 

I hope that helps.

If you've read Getting Things Done, you know that the key to a less stressful and more zen like life is by getting things out of your head and onto a list that you periodically review.  I use two tools to accomplish that, OneNote and Toodledo.

Toodledo is a to-do list on steroids. You can create different folders and lists as well as assign work to your team members.  Very valuable for making sure things don't fall through the cracks.

OneNote is more valuable than I can describe. I'm a software engineer and when I have a new project, I create a OneNote notebook, that I call a Wiki.  Wiki is a Hawaiian term for "quick" - and boy is it quick. I put everything in there related to the project. I break it down into sections and throw all of my research, customer info, etc. into the project Wiki.  I also share the Wiki with my team so that they can add to it. 

Then when I begin formal planning and design I have all of the knowledge for that project in one place that I can "quickly" retrieve. I even create a section in the notebook for the formal planning and design work.

I also use OneNote to keep track of all new technical information. For example, I have a Programming Wiki notebook, with sections on: C#, Bootstrap, .NET, JQuery, Javascript, CSS, PHP, SQL, Visual Studio, etc. When I find myself looking on the Internet for an answer to something I don't know, I save the answer in my Wiki section.  That way if I run into the problem again, I don't waste time looking for the solution.

I also use OneNote notebooks for personal stuff like genealogy, major projects around the house (I'm designing a outdoor space), etc.  

OneNote and Toodledo are two tools my team and I can't live without. 

P.S. - One guy recommends brainstorming to find tools.  You can keep all of the ideas from brainstorming in a OneNote notebook - for example: the Great Apps Wiki.  You can share with your team and you'd be surprised what you come up with.  You could even clip this comment into your OneNote Wiki.