The first thing I noticed after switching to #Linux is the lack of a good dictionary app. The only good #dictionary appears to be GoldenDict-ng but the UI looks dated. So, based on my past experiences in working with OSS Dict (a fork of Aard 2), I came up with my own implementation for Linux. I've just made the very first release of the app here: https://github.com/MuntashirAkon/SlobDict/releases/tag/1.0.0
Release Slob Dictionary v1.0.0 · MuntashirAkon/SlobDict

Initial release. Slob Dictionary is an application with a polished GTK 4 interface for exploring slob-formatted dictionaries on Linux, converting when necessary. Key features: ...

GitHub

It features almost all the features offered by OSS Dict or Aard 2 in addition to support for many other dictionaries. Key features include:

- Fast and simultaneous lookup across multiple dictionary files
- Persistent lookup history to revisit entries effortlessly
- Bookmarks for saving favorite definitions and terms
- Native light/dark mode following your GNOME desktop theme
- Supported dictionaries: Aard 2 (.slob), Almaany.com (SQLite3), AppleDict Binary(.dictionary, .data), AyanDict SQLite, Babylon (.BGL), cc-kedict, Crawler Directory(.crawler), CSV (.csv), DictionaryForMIDs(.mids), Dict.cc (SQLite3), Dict.cc (SQLite3) - Split, DICT.org file format (.index), dictunformat output file(.dictunformat), DigitalNK (SQLite3, N-Korean), ABBYY Lingvo DSL (.dsl), Kobo E-Reader Dictfile (.df), EDICT2 (CEDICT) (.u8), EDLIN(.edlin), FreeDict (.tei), Gettext Source (.po), Glossary Info (.info), JMDict (xml), JMnedict, Lingoes Source (.ldf), Makindo Medical Reference (SQLite3), Octopus MDict (.mdx), QuickDic version 6 (.quickdic), StarDict (.ifo), StarDict Textual File (.xml), Tabfile (.txt, .dic), Test Format File(.test), Wiktextract (.jsonl), WordNet, Wordset.org JSON directory, XDXF (.xdxf), XDXF with CSS and JS, XDXF Lax (.xdxf), Yomichan (.zip), Zim (.zim, for Kiwix).

Since this is a desktop platform, we have the opportunity to make it support a number of dictionaries as storage is not a cause for concern. Also, since I'm a #GNOME user, the app is written in #GTK 4, and you can install the flatpak file using GNOME Software app.
Future plan includes adding third-party support (no idea how I can do that since I switched to a Linux desktop after a long time and never developed any apps for Linux before), GNOME integration (not sure how challenging it is), and custom lists.
Oh, and it is called Slob Dictionary because internally I still use the SLOB format which, in my experience, has the fastest lookup support.