I'm not a great fan of commercial software, but there are some tools that are probably worth paying for -- otherwise the author wouldn't be able to maintain the code. I know from personal experience that relying on donations doesn't pay the bills.
I came across PSE Terminator today and I must say I'm quite impressed. I usually have to do all of this by hand and this tool could save a huge amount of time. I'll need to start saving up so I can afford to buy it!