HotaruCMS development hosted on the Assembla project space. You can SVN checkout the project from the SVN URL or view the repository online.
All the plugins, themes and translation packs are under version control on Assembla. You can SVN checkout the Hotaru Extensions project repository from the SVN URL or view the repository online.
One thing to note: It will take you ages to upload that folder to the web because of all the .svn folders in it. However, if you right-click the folder, click TortoiseSVN->Export... and export all versioned files to a new folder. That will give you an unversioned copy (without all the little green circles and .svn folders).
Advanced: Installing Directly from SVN