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I use whatever I can download in a hurry. I try to stay away from serial in the SCADA world, its almost unavoidable but manufacturers are starting to realize that its going the way of the Dodo.
For legacy devices I usually get a gateway, usually if I'm going Modbus RTU to TCP I work with Moxa equipment. I usually do my best to pick equipment that doesn't have serial, or if I do, I buy the proper gateways and translators to get them into a modern network.
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Unfortunately, the electric power industry is far behind the rest of the world. My boss still doesn't quite trust solid state relays, and would prefer that we protect our lines and substations with the electromechanical sort. Schweitzer Engineering Laboratories (SEL, INC) pioneered solid state relays, and produces some of the best, but they still think RS232 is pretty neat. We just got a notice that our satellite clock modules have a glitch, and the only way to update the firmware is via a serial port. 
Will Rogers never met me.
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I work in the electric/solar power industry as well (new contract, I usually do Oil/Gas), some of our engineers (not me) are well versed with Schweitzer's. Fortunately when a new project comes along they let me dictate parts. We have some older equipment still working off of serial but as it gets upgraded we are using gateways.
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We have SEL2032 Communications Processors in each of our substations, linked via Ethernet on a private radio network, but they're not connected to the clocks that require updating. Unfortunately, I'm not well versed in the SEL stuff, either, and have no idea how to connect them to the 2032s. If I did, I could probably do the update from my desk, instead of taking a laptop far into the desert with a serial cable...
Will Rogers never met me.
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I use TeraTerm[^] and have had pretty good success. Another very good one is Putty.
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In lieu of HyperTerminal, I use HyperTerminal[^] - because its full of Microsoft goodness. 
Government is not reason; it is not eloquent; it is force. Like fire, it is a dangerous servant and a fearful master. ~ George Washington
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Mike Mullikin wrote: because its full of Microsoft goodness.
You're not one of the candidates being considered to replace Balmer are you? 
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Mike Hankey wrote: You're not one of the candidates being considered to replace Balmer are you?
I use a Mac... I'm over qualified.  
Government is not reason; it is not eloquent; it is force. Like fire, it is a dangerous servant and a fearful master. ~ George Washington
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Good comeback and true enough!
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I saw Putty on an Arduino site couple of years ago and downloaded it. Still using it for GPS and Arduino. Very easy to use.
Peter Wasser
Art is making something out of nothing and selling it.
Frank Zappa
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I had Putty but when I reloaded my machine I didn't put it back on, using Tera Term now it's simple and I don't use it a lot.
Best all around Arduino site I've found is AVRFreak, been a member for a couple of years.
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That's certainly worth a look; Thanks! 
Will Rogers never met me.
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my RFID reader communicates over RS232 and it is fairly new.
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Roger Wright wrote: What's your favorite,
RealTerm[^]
Roger Wright wrote: and why?
It's free and pretty comprehensive
MVVM # - I did it My Way
___________________________________________
Man, you're a god. - walterhevedeich 26/05/2011
.\\axxx
(That's an 'M')
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I have used LookRS 232[^] with good results. I like it because it allows command scripting. Otherwise I generally write my own applications for using custom binary data formats coming from our products.
Most of our product use SoC as the brains on our products the best way for me to test the systems are through the SCI (Serial Communication Interface) RS 232 is the easiest, quickest and most reliable for collecting data from our products during testing (Read least expensive). When the products are ready for consumer market we will have ported them to Bluetooth or USB interfaces with simplified data formats. But some of our customers still want RS232 or RS485.
It was broke, so I fixed it.
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QVT/Term, been using it since the mid-90s. It does serial and Telnet, so it's what I use for working with my OpenVMS servers even when HyperTerminal is available.
I'm no longer sure whether or not I pirated my copy. I do know that I didn't pay for it, but I thought I had downloaded it from QPC.com (which no longer knows what I'm talking about).
http://download.cnet.com/QVT-Net/3000-2160_4-10003575.html[^]
I may still have a copy of Procomm laying around...
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Teraterm for general purpose hyperterm replacement use, but realterm for playing down with the fiddly bits of micro's. Realterm provides lots of control, including sending pre-canned strings, multi-format decodes, etc.
Both free, but appeals to slightly different uses, one pretty high level, and the other for playing in the serial weeds.
And unfortunately, I suspect serial will be around for some time, although some Mfr's are seeing the light of the next generation.
Ken
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I wrote my own called NTerm using WPF, I use it for Cisco appliances.
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I wrote my own using the serial port class (that led to an article here Serial Comms in C# for Beginners[^], why did M$ give up with shipping HyperTerminal with new versions of Windows's. When first setting up a PC we have to install HyperTerm Private edition (and pray the licence we have has not expired!)
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I use Hercules[^] whenever I need one of the following: Serial Communication, TCP Client, TCP Server, UDP Communication
It's free and doesn't require an installation (standalone exe)
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putty, minimal, no annoying and only makes sessions in you want. The fantastic program wich does not put his hands in your pocket.
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Hterm [] works for me. I haven't compared it to other emulators mentioned here so I can't claim that it's the best, but it talks to PIC micros over USBser.sys conveniently without fuss. Also python's serial module is pretty easy to use if you fancy writing your own interface instead of using a terminal emulator.
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I copy hypertrm.exe and hypertrm.dll from an old XP box to a directory on the new box...
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