Marta has been discontinued. Similar apps include Double Commander, which is free and open source. Other options are Total Commander, Cmdr, ForkLift and CoverFlowFinder. There's no shortage of File Managers like Marta, with more than 25 alternatives for Mac, Windows, Linux, the web and Android.
DoubleXplorer is a dual-pane file manager for macOS with a range of features, including a Command Palette, rich archive support (7z, Rar, Tar, Zip), file comparison, connection to servers (Dropbox, Microsoft OneDrive, SFTP, FTP), and more.
Poland
EU
nViPER is a fast, keyboard-first dual-pane file manager for macOS and Windows — a modern revival of the original 2001 nViPER. Two panels side by side let you copy, move and organize files far quicker than a single-window explorer.
SlovakiaEU
Metro Commander is an orthodox file manager which allows you to manage your files and folders from within the Modern Windows UI interface.
EstoniaEU
SADFinder is a fast, customizable file manager for Mac. Keep several folders open in tabs, jump anywhere with an editable path bar, filter the current folder, or search filenames and Spotlight-indexed document contents without losing your place.
RomaniaEU
DCommander is a two-pane file manager that gives you full control over your computer's filesystem.
AustriaEU
Synapse Commander is a dual-pane macOS file manager that lets you work with local disks and network servers side by side, supporting FTP/FTPS, SFTP, SMB/WebDAV, smart sync, batch rename, and keyboard-driven workflows.
CzechiaEU
A file manager for Mac that brings your Windows Explorer habits — folder tree, address bar, cut and paste — with nothing taken away from macOS.
