Similar to Twisted

Requests
Requests (software)
Kivy
Kivy (framework)
Aria2

Avahi
Avahi (software)
Cacti
Cacti (software)
DD-WRT
DD-WRT
Firewalld
Firewalld
FreeRDP

GNU Wget
Wget
HTTrack
HTTrack
Icinga
Icinga
Ipfirewall
Ipfirewall
Iproute2
Iproute2
Iptables
Iptables
Iw (Linux)

Jigdo
Jigdo
Kdenetwork
KdenetworkKGet
KGet
Kismet
Kismet (software)
KNetAttach

KNode
Kontact#Usenet News Client
Konversation
Konversation
KPPP
Kppp
KSirc

Shadowsocks
Shadowsocks
APBS (ソフトウェア)
APBS (software)
AutoKey
AutoKey
Calibre
Calibre (software)