Free, dual pane file manager with tabs, comes as installer or portable version, heavily customizable
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Pro Separate tree for each panel
Pro Portable version available
Pro File coloring based on filters
Including optional background coloring.
Limitation of this pro: text and background color cannot be taken from 2 different filters and thus combined but on the positive side: it provides coloring profiles, which can be switched (supposedly easily).
Pro Both 32 bit and 64 bit versions available
Pro Heavily customizable
Besides many customizable on-board options and features, one can also write his/her own scripts and even full plug-ins.
Pro Full of features
Multi-rename, convert line break of files (CR, LF, CRLF), double panel, folder tree, tabbed interface, colourized tabs, .... a hundred different options
Pro Powerful scripting system
You can easily write powerful scripts even without knowledge of programming.
Pro Support for FTP, Registry, and OneDrive
Pro Written in C++
The program launches fast.