List of Server applications you can run in Ubuntu / Debian Linux

Name of some Server applications you can run in Ubuntu / Debian Linux

apache — Web server

boa — lightweight Web server
sshd — ssh server
sendmail — mail server
qmail — mail server
postfix — mail server
named — DNS server

bind    --- DNS Server
squid — Web proxy server
nessusd — penetration testing server
postgresql — database server
mysql — database server
oracle — database server

telnet — telnet server
wu-ftpd —  ftp server
vsftpf  ---- ftp server  
samba  --  windows file sharing


And more............