Hello, and welcome!
There are a multitude of non-graphical Twitter clients and subordinate Twitter tools, as Twitter has an SMS interface. Some of these are in the OpenBSD Ports/Packages system. As I've never used any of these, I have no opinion of them.
devel/p5-Term-ReadLine-TTYtter
net/p5-Net-Twitter
net/p5-Net-Twitter-Lite
net/py-twitter
net/tircd
net/twirssi
Other than file converters, I'm not aware of any Wiki-tools in the Ports tree that are non-graphical. That doesn't mean there aren't any, it just means I lack knowledge.