I mentioned this app some time ago and though I used the demo I never bought it (originally around $300). Nonetheless, I thought it was incredibly useful and ingenious. I just saw that earlier this year GridIron (amazingly) released a free Essentials version with a modular architecture so you can buy add-ons to extend the already considerable basic functionality if and when you want or need to. The advanced features use a subscription model (yeah, yeah, I know, I’m not a fan either) but unless you need it you’re not obligated to buy it.
MacWorld review: http://www.macworld.com/article/158346/2011/04/flow2.html
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