Alien is an icon theme for Gnome, Deepin, XFCE and Budgie DE with nearly 1000 apps icons. The icon theme comes in different colors to choose from. Alien is based on “Black Sur” and “Papirus” icon theme.
It’s possible to request icons that is missing. Just let me know 
Tested: Fedora 39 Workstation (Gnome), Zorin 16.3 core/pro/lite, Ubuntu Budgie DE.
icon theme(s) Released!!! See first post for link. 
Bit by bit, I’m implementing KDE support. It going to take time, as KDE has alot of icons, so don’t expect fully support at once.
Version 2.1 is available via github.
What’s new from the version 1.0 to version 2.1?
Added: ConvertAll, nextcloud, protonvpn, compiz,
Added: falkon, guitarix, hedgewars, kile, mplayer,
Added: octave, strawberry,
New color: Pink
Added: misc. KDE icons - first step to KDE support
Added: akregator, konsole, nemo, openvpn, orca
Added: Firefox (flatpak), pavucontrol, rstudio,
Added: kdeconnect, kleopatra, kmail, knotes,
Added: kolourpaint, ktorrent, lynx, marble,
Added: Bluemail, elisa, gwenviewer, ark, skanlite,
Added: yakuake, alacritty, anki, dialect, btop,
Added: easyeffect, peaZip, librewolf,
Added: Recent folder,
Added; mime type icons for libre office
Fixed: color issues regarding dark action and panel icons for Zorin OS
Fixed: many misc. bug fixing
Fixed: Open folder icon missing
Added: firefox nightly,
Added: backup folder, Git folder, Science folder,
Added: Sync folder,
Fixed: .bz2 mimetype (was showing as .tar)
Fixed: Yellow folders color.
Fixed missing symbols on folders
