3 most used and needed applications/tools in your life

Every IT person has a toolset that contains his or her most needed apps. They can be installed apps such as Outlook or Excel, or could be poertable apps such as Sysinternals suit or Putty.

What are YOUR 3 most used and most needed apps, the ones you immediately run to install anytime you need to use a new system?

Name them, not necessarily by order (unless you clearly have one or two favorites).

To make it more interesting, if someone already gave the name of an app you planned to give, add it anyway and mark it as “already given by…”, and then add 3 other apps of your own.

For example, user A says:

Quote:
My 3 favorite apps are:
app1
app2
app3
User B says:

Quote:
My 3 favorite apps are:
app1 (already given by user A)
app4
app5
app6
User C says:

Quote:
My 3 favorite apps are:
app1 (already given by user A)
app5 (already given by user B)
app7
app8
app9