For remote desktop applications, I use
TeamViewer, which is free for personal use and works with Windows, Mac OS X, Linux, Ubuntu, iPhone, iPad, etc. It's very
secure and private and quite simple to set up and use (no messing around with ports), which comes in handy if providing remote support to those who aren't very computer literate. You can talk them through the setup on their end and be connected to them in less than a minute. I prefer it over LogMeIn because it includes free file transfers between computers, a feature I use frequently. Also, TeamViewer doesn't affect audio settings on OS X, as
many have reported that LogMeIn does.
iStat Pro (free) or
iStat Menus ($16) will give you accurate readings of battery health, temperatures, fan speeds and many other things. A forum member has posted a copy of iStat Pro that has been "tweaked" to enhance compatibility with Mountain Lion and later. You can download it
here.
But I have no idea what other Mac utilities or apps are the most popular for things like IRC, Remote Desktop, VPN, etc...unless those are all built into OS X too?
So, if you had to pick a few must-have recommendations for a new iMac owner who hasn't ever used a Mac before, what would be on your list?
What you
don't need are any "maintenance" or "cleaner" apps for OS X, as it does a good job of taking care of itself. As long as you practice safe computing, you don't need any antivirus apps, since there are no OS X viruses in the wild and all OS X malware can be avoided by a prudent user.
Macs are not immune to malware, but no true viruses exist in the wild that can run on Mac OS X, and there never have been any since it was released over 12 years ago. The only malware in the wild that can affect Mac OS X is a handful of trojans, which can be easily avoided by practicing safe computing (see below). 3rd party antivirus apps are not necessary to keep a Mac malware-free, as long as a user practices safe computing, as described in the following link.
Read the
What security steps should I take? section of the
Mac Virus/Malware FAQ for tips on practicing safe computing.
You don't need "cleaner" or "maintenance" apps to keep your Mac running well, and some of these apps can do more harm than good. Most only remove files/folders or unused languages or architectures, which does nothing more than free up some drive space, with the risk of deleting something important in the process.
These apps will not make your Mac run faster or more efficiently, since having stuff stored on a drive does not impact performance, unless you're running out of drive space. In fact, deleting some caches can hurt performance, rather than help it, since more system resources are used and performance suffers while each cache is being rebuilt.
Many of these tasks should only be done selectively to troubleshoot specific problems, not en masse as routine maintenance. OS X does a good job of taking care of itself, without the need for 3rd party software. Among other things, it has its own maintenance scripts that run silently in the background on a daily, weekly and monthly basis, without user intervention.
Some people repair, or recommend repairing permissions for situations where it isn't appropriate. Repairing permissions only addresses very specific issues. It is not a "cure all" or a general performance enhancer, and doesn't need to be done on a regular basis. It also doesn't address permissions problems with your files or 3rd party apps.