Modes include highlighting schemes, active strings, menu and tool bar customizations for editing specific sorts of text.
To install them create a directory %b\Config\<mode name> and extract the zip file in there. You will find a macro called install.edt or similar which you want to execute ("Macros | Execute Macro..."). Before installing a mode you should backup your settings ("Options | Configurations | Backup"), in case anything goes wrong, or if you don't like the mode.

To install the menus, go to "Options | Menu Setup...") and choose the appropriate tab ("Main Menu" resp. "Popup Menu"). Click on "Append..." (the rightmost button; or by performing a right-click) and choose the file you downloaded.
Some menu items call macros from the WinEdt Macro Library. You may have to download and install these macros separately.

To get a longer description and installation instructions, click on the name of the component.
If you click on the Version link (on the right), you can download the component immediately.

?	Name	Description	Last changed	Down- load
General
	Toolkit Installator	A selection of useful macros from www.winedt.org enriched by JErik's modifications and macros, installable without the need of manual adjustment.	06.06.2007	5.5
Modes
	BibStyle	Menu, highlighting and dynamic command completion for BibTEX style files.	06.06.2007	5.4
	DTX	Highlighting settings, Active Strings, Tree directives and more for documented LaTEX source files (DTX)	15.01.2008	5.5
	Diff	Highlighting settings for diff files (diff -u)	02.10.2006	5.4
	EDTplus	Dynamic highlighting and completion of Local Registers for WinEdt macros.	06.06.2007	5.4
	Mail	Highlighting settings and menus for e-mails and usenet postings.	18.02.2003	5.3
	PostScript	Highlighting settings for PostScript (ps and eps) and PDF files	20.02.2006	5.4
	Stata	Highlighting, Active Strings, Menu and Tool bar customizations for Stata.	16.12.2003	5.3
	dynamicLaTEX	Dynamically loads dictionaries for LaTEX packages used in the current document for word completion, and set the submode according to babel's options	08.01.2008	5.4
	AutoMode	Macro component for automatically changing editor layout	17.12.2001	5.3
	awk	This configuration component contains highlighting, active strings, menu and tool bar customizations for (gnu) awk.	12.04.2002	5.3
	Fortran90	Highlighting (static and dynamic), active strings, dictionary, menus, keyword search, buttons and images, tool bar customizations, compilation support and many more for the Fortran 90 computer language and its later standards.	24.01.2007	5,5
	Perl 5	This configuration component contains highlighting, active strings, menu and tool bar customizations for Perl 5.	29.11.2001	5.3
	PL/SQL	This configuration component contains highlighting, menu and tool bar customizations for programming Oracle PL/SQL 8i.	29.11.2001	5.3
	Template	This is a template for making configuration components for WinEdt 5.x. All my configuration components are based on this template.	04.12.2001	5.3
	R-Sweave	Variant of RWinEdt including Sweave support	03.10.2008	5.5
	RWinEdt [external link]	Configuration component for the R statistical software	[N/A]	5.2
Menus & Shortcut Schemes
	BibTeX (bibMacros)	Menu and set of macros to assist editing and managing BibTEX files	07.06.2007	5.3
	Bookmarks	Invisible Popup Menu to use WinEdt's bookmark feature.	13.03.2002	5.3
	CVS	Menu containing the basic commands for using a CVS Version Control System	16.01.2003	5.3
	RCS	Integrate a Revision Control System into WinEdt	20.08.2006	5.4
	German	Complete German translation of WinEdt 5.5's (Main and Popup) menus.	17.09.2007	5,5
	Russian	Complete Russian translation of WinEdt 5.5's Main menus, many macros, dialogs and wizards, as well as the Tree and Gather pages.	10.03.2008	5.5
	French	Complete French translation of WinEdt 5.5's Main and Popup menus.	08.01.2008	5.5
	SVN	Menu containing the basic commands for using a SVN Version Control System	12.05.2008	5.5
Graphical User Interface (GUI) additions
	IntQuotation	Icons for German, English and French quotation marks in LaTEX	08.09.2004	5.3
	Xy-pic	Adds a GUI Page providing access to Xy-pic commands.	31.08.2002	5.3
	feynMF	GUI bitmaps for LaTeX package feynMF -- drawing of Feynman diagrams with METAFONT (MetaPost).	30.07.2003	5.2

Contributions

Contributions of modes, menus or shortcut schemes are always welcome.
Actually, WinEdt.org lives off the contributions (your contributions!)!

So, whenever you think that you have compiled a mode or a menu that could be useful to more people than just you, don't wait to submit it.

Read this, if you have decided to contribute or think about it.