Tested on PS3 firmware 3.55, but should work for any firmware.
CHMOD (file permission setting)
Almost all FTP commands are supported
1.1 - stability, performance, and bugfix
1.2 - passive mode bugfix and other stuff
1.3 - REALLY BIG AND AWESOME UPDATE
1.4 - The finale
1.5 - Encore
2.0 - fresh start - as of version 2.0, OpenPS3FTP is located under Network.
2.1 - minor improvements
2.1.1 - more improvements and major fix
2.2 - rewrite for psl1ght v2 + fixes - as of version 2.2, any password is accepted by default.
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This is my #1 FTP server since the blackb0x one. MultiMAN FTP doesn't work for me. I've this in program in version 2.1 with no password needed and it works superb. I think this version 3.0 could be the really last build of this great and stable working program.
MultiMAN now uses an older version of this (it's much better than what MultiMAN was using before).
As for this v3.0, as far as I can tell it doesn't work, and it is labeled on his site as an unofficial/in-development build. The last official release is v2.3, and it works fine.
v3.0 however (at the time of posting this) doesn't work at all for me. The icon on the XMB has no description/title beside it, and when you run the app it just crashes/kicks you back to the XMB, but the v2.3 still works fine when I went back to it.
It's better than blackb0x's FTP by far (more stable, just as fast, ability to set your own password or none at all) but since this version is not ready, download v2.3 instead for now.