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Android
Minimum requirements: Android 4.1 Jelly Bean
Download options without automatic updates
iPhone/iPad
Minimum requirements: iOS 12, iPhone 5s or iPad 5/Air/Mini 2
macOS
Homebrew manual install: brew install --cask deltachat
Minimum requirements: macOS 10.15 Catalina
Download options without automatic updates
Windows
Winget install: winget install 9PJTXX7HN3PK
Minimum requirements: Windows 10
Download options without automatic updates
GNU/Linux
Flatpak manual install: flatpak install flathub chat.delta.desktop
Arch manual install: pacman -S deltachat-desktop
Nix manual install: nix-env -f "<nixpkgs>" -iA deltachat-desktop
Snap manual install (community maintained): sudo snap install deltachat-desktop
Minimum requirements: Ubuntu 18.04, Fedora 29, Debian 10 or compatible systems
Download options without automatic updates
Ubuntu Touch
Minimum requirements: Ubuntu Touch 16.04
See blog for details about this community driven effort
Source Code

The desktop versions do not require Delta Chat to be installed on a phone.

Changelogs & More