Core FTP is an FTP client with all the features you'd expect: SSL support,
browser integration, resume transfers, drag and drop support, command line
transfers etc.
Along with SSL, Core FTP supports both the TLS and SFTP methods for secure
transfer of files, and files can be queued and resumed should the need arise.
Auto-connection of lost transfers is included, and it appears to support
large files. There is no mention of the maximum file size supported, and the
largest file we tried was only 300Mb, but it's likely to be more than enough for
most users.
The interface may seem a little basic but this is only an FTP client, and in
some respects a simple interface is more suitable for the tasks to be performed.
The only downside is a lack of documentation; should you wish to try out some
of the more advanced features you're on your own.