Psi

Rarity: Common

The most frequent rarity: most Wikipedia articles become Commons.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

At a glance

Class

Invention

Domain

Science and technology

Knowledge cost

2

In collections

1 player has it in their collection.

What Wikipedia says

Psi is a free instant messaging client for the XMPP protocol which uses the Qt toolkit. It runs on Linux (and other Unix-like operating systems), Windows, macOS and OS/2 (including eComStation and ArcaOS).

Excerpt from the Wikipedia article “Psi (instant messaging client)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Калий, GPL, via Wikimedia Commons.