Mac software that does what you need, by @UINT_MIN

Joined November 2010
Belkadan Software returns! Introducing Hermit Crab, a free Mac app that allows you to quickly run shell commands from anywhere. belkadan.com/hermitcrab
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1.0.2 release today with some small improvements to the user experience: restoring focus to the previously active app, plus a hang fix. You can check for updates in the Action (gear) menu. (For the curious, 1.0 is actually 1.0.1, with 1.0 never released publicly.)
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Today's 1.0.3 release switches to using a login shell to run commands, so any environment customization you have set up will work (including PATH). You can check for updates in the Action (gear) menu.
Webmailer 1.3, now with custom browsers + AppleScript support! belkadan.com/webmailer. The source is also now on Github: github.com/belkadan/Webmaile…
Keystone 1.1.2 is a small update: belkadan.com/keystone. But you can also now get the source on Github at github.com/belkadan/Keystone!
New release means a few last bugs: if you're still running Leopard (or *gasp* Tiger), you should redownload Keystone or Webmailer.
Keystone joins Webmailer with full Lion compatibility! Note that if you already have Lion, you will have to redownload: belkadan.com/keystone
Webmailer is fully Lion-compatible! If you're experiencing issues, grab the update from the preference pane. (Keystone coming soon!)
The blog is back! Hopefully I'll be posting any future programming- and tech-related musings here in the future. http://belkadan.com/blog
Webmailer 1.2 is out! New feature: intelligently choosing which browser to open your webmail in. Get it from http://belkadan.com/webmailer !
One of the most requested features for Webmailer is for it to know which browser a mailto link came from. Started working on it yesterday!
Keystone 1.1 has been released! Check it out at http://belkadan.com/keystone
News on Keystone, BTW...it's working in Safari 5, but still has a few bugs. It will be released "soon" regardless! (Hey, I'm a student.)
Hello, world! Inspired by @panic (and @redsweater), Belkadan Software now has a Twitter for μ-support. Now, will anyone actually message me?