1) Gobby
Http://gobby.0x539.de/trac/
Figure: Gobby Interface
Gobby is a free collaborative editor that supports multi-document and multi-user chat in a Single Window. It can run on Microsoft Windows, Mac OS X, Linux, and other unix-like platforms. It uses GTK + 2.6 as its desktop package.
I mainly think his chat function is quite interesting. Maybe it can be used.
2). FileZilla
Http://filezilla-project.org/
FileZilla is a high-speed FTP and SFTP client.
3). GParted
Http://gparted.sourceforge.net/
GParted is an industrial software package used to create, destroy, change the size, move, and check the copy partition file system. It is useful in creating partitions for a new operating system, organizing disk space, copying or mirroring data on a physical disk.
4). openSSH
Http://www.openssh.org/
OpenSSH is a free SSH connection software that is relied on by network technicians. Telnet, rlogin, and ftp users realize that their passwords are not encrypted on the Internet. OpenSSH encrypts all communications (including passwords) to effectively eliminate network eavesdropping, connection hijacking, and other attacks. In addition, OpenSSH provides Secure Channel Technology, multiple authentication methods, and supports all SHH version protocols.
5). Wink
Http://www.debugmode.com/wink/
Wink is a very good free screen recording software, especially suitable for creating computer operation tutorials. Wink is free, small, can add sound at the same time or after the event, can add pause and jump buttons, add notes, and generate flash files much smaller than other software. Suitable for instructors.
There are more open-source software:
Http://server.it168.com/a2010/0811/1089/000001089290_all.shtml