Downloading SnailSVN 1.15.3 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. SnailSVN for Mac lies within Developer Tools, more precisely Webmaster Tools. This Mac app is a product of Langui. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
SnailSVN is a TortoiseSVN-like Apache Subversion (SVN) client, implemented as a Finder extension. The tool lets you access the most frequently used SVN features directly from the Finder context menu. It tracks your SVN 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 software for Mac, such as SnailSVNLite, which might be similar to SnailSVN.