thingsaurus
This is a 'thesaurus for things' or similarity engine: results show things that have something in common with what you enter. The more stars, the more things in common! You can use it for research, recommendations or simply to explore ideas and related subjects.
Here are your results for OpenSMTPD...
Stars indicate closer matches.
OpenBGPD 
- OpenIKED
- OpenNTPD
- OpenOSPFD
- Sensorsd
- Sndio
- Spamd
- Cwm (window manager)
- OpenBSD
- Mandoc
- Apache James
- Axigen
- Courier Mail Server
- Cyrus IMAP server
- Exim
- MeTA1
- Postfix (software)
- Qmail
- Sendmail
- Bioctl
- Bus dma
- Bus space
- Busdma
- Hw.sensors
- Kqueue
- PF (firewall)
- Pfsync
- Soft updates
- Systat (BSD)
- Systrace
- Xenocara
- Dovecot (software)
- Zentyal
- /dev/bio
- /dev/pf
- Absolute OpenBSD
- AdJ
- Anonym.OS
- Bio(4)
- Bitrig
- Common Address Redundancy Protocol
- OpenBSD Cryptographic Framework
- Fdm (software)
- Hackathon
- Hostapd
- OpenBSD Journal
- LibreSSL
- Mg (text editor)
- MirOS BSD
- OliveBSD
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