LinkABoo is an application which is able to create hyperlinks pointing to specific e-mail messages inside Apple’s Mail application. Links created by LinkABoo can be used just like any “regular” hyperlinks (because that's what they are) on Mac OS X. For instance, you could create a linked Internet location file (URL clipping file) in the Finder, put it on the Dock, add the link to a Calendar event or even link to an-email from the shell. Basically, you can create and utilize such links in any Mac OS X application or context where you can make use of hyperlinks.
LinkABoo requires Mac OS X 10.4 or newer (and, of course, “Mail”). As 10.5 introduced a similar mechanism, LinkABoo is usually not needed on systems newer than 10.4. Download LinkABoo 1.0.3 (07/17/2013, 711 KB, Universal Binary. This version is functionally identical to version 1.0.2 from 2008, but is freeware.)
Plain Clip Plug is a plug-in for Spark which removes any formatting from text which is on the clipboard. It is more or less identical to Plain Clip, but, compared to Plain Clip 1, offered an additional feature (sending an emulated ⌘-V, or in other words: the “Paste” shortcut). Since version 2, this can also be done with Plain Clip, so I recommend calling Plain Clip from within Spark instead of using the plugin. Download Plain Clip Plug 2.0.2 (02/15/2006, 100 KB, Universal Binary)
BBClick can be used with BBEdit prior to version 8.5 to create keyboard shortcuts for the function popup and the marker popup. Download BBClick 1.0.1 (05/25/2007, 64 KB, Universal Binary)