LinkThing 2.3 for Mac was available as a free download on our application library. The program is categorized as Internet & Network Tools. The actual developer of this free Mac application is Canisbos Computing.
From the developer:
LinkThing is a Safari extension which enhances your control over how links on Web pages are opened. Features Have Safari open links in new tabs by default (when you just click them normally). You can apply this setting globally or per-site, and you can apply it to offsite links and onsite links independently. Optionally open links in new tabs by right-clicking them. (You can still get the link's context menu by Control-clicking it.
You may want to check out more software for Mac, such as Delete Flash Cookies, Subio or RSS Checker, which might be related to LinkThing.