Aside from a lot of the ones that are abbreviations (like GNU Image Manipulation Program, or GIMP), most of them are fine I think.

Immich, it sounds like “image”, which makes sense for photo hosting. Inkscape is a landscape of ink, suitable for a vector graphics editor. “Chrono”, the clock app on Android, is named after the embodiment of time. Radicale, the CalDAV self-hosted service, is the word “radical” conjoined with “calendar”. KeePass is a password manager, a master key is used to unlock the vault. KDE likes to put “K” in front of a lot of their app names. KCalc, KGet, Konsole, KOrganizer, KAlarm, KWrite. Their functions are pretty self explanatory. Okular is a PDF reader by KDE, and the name is a play on the word “ocular”, used to describe vision, but with a “K”! MarkText lets you write text in Markdown format. LibreOffice is a free (as in freedom, or libre) open-source office suite. Writer, Impress, and Calc are related to documents, presentations, and spreadsheets. And then there are all the apps that are not unique and are simply what they are. Think “Offline Translator”, “OSS Document Scanner”, etc. (very common with a lot of Android apps I use)

I would imagine Kittygram refers to the vast quantities of cat photos on Instagram.