CrushFTP 9.0 for Mac could be downloaded from 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 Internet & Network Tools, more precisely Network tools. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The actual developer of this software for Mac is Ben Spink.
From the developer:
CrushFTP handles FTP, SFTP (SSH FTP), FTPS (FTP over SSL), HTTP, HTTPS, WebDAV, and WebDAV SSL. WebDAV allows you to use the OS X Finder to connect to the server and work on it as if it were another hard drive on your machine. Read, write, rename. all with WebDAV. The built in fully customizable WebInterface allows you to present a website to customers so they can easily upload files to you, or download files to you.
You may want to check out more software for Mac, such as PPPoE Connector, tn3270 or Remote Connections Manager, which might be similar to CrushFTP.