The 1.1 version of SnailHg for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The application lies within Developer Tools, more precisely Webmaster Tools. We recommend checking the downloaded files with any free antivirus. The actual developer of this free software for Mac is Langui.
From the developer:
SnailHg is a TortoiseHg-like Hg (Mercurial) client, implemented as a Finder extension. You can access directly from Finder the most frequently used Hg features. It tracks your Hg working copies and updates the icon overlays automatically, giving you visual feedback of the current state of your working copies.
You may want to check out more Mac applications, such as AcidSearch Installer, Browsealoud or RAGE WebDesign, which might be related to SnailHg.