Added many new contributions from pull request

README.md

@@ -8,7 +8,7 @@ Some links are available to [related resources](#resources).
 
 # Summary
 
-* Apps/tools: **1425**
+* Apps/tools: **1437**
 * Categories: **76**
 
 # Index
@@ -26,7 +26,7 @@ Some links are available to [related resources](#resources).
 * [Office tools](#office) (15), [Online search and resources](#online) (18), [Organizers and calendars](#organizers) (22)
 * [Package managers](#package-manager) (16), [Password managers](#password-manager) (20), [Pastebin](#pastebin) (3), [Process viewers and monitoring (alternatives to top)](#monitor-top) (26), [Productivity](#productivity) (10), [Program templates and boilerplate](#programming-boilerplate) (11), [Programming](#programming) (37), [Prompts](#prompt) (4)
 * [RSS](#rss) (10), [Religion](#religion) (4)
-* [Science](#science) (19), [Screen recorder](#screen-recorder) (10), [Screen savers](#screensaver) (4), [Security and encryption](#security) (31), [Shells](#shells) (14), [Sound and music](#music) (46), [System monitoring](#monitor) (29), [System tools](#system) (26)
+* [Science](#science) (19), [Screen recorder](#screen-recorder) (10), [Screen savers](#screensaver) (4), [Security and encryption](#security) (31), [Shells](#shells) (26), [Sound and music](#music) (46), [System monitoring](#monitor) (29), [System tools](#system) (26)
 * [Terminals](#terminal) (14), [Text processing](#text-processing) (34), [Text search (alternatives to grep)](#text-search) (11), [Text search and replace (alternatives to sed)](#text-search-replace) (6), [Time trackers](#time-tracker) (16), [Todo managers](#todo-manager) (31), [Torrent](#torrent) (7), [Typing test and practice](#typing) (9)
 * [Utilities](#utility) (40)
 * [Versioning](#versioning) (9), [Video](#video) (11), [Viewers](#viewers) (26)
@@ -1362,19 +1362,31 @@ Cryptography, ciphered archive managers, encrypted file-systems.
 
 Shell programs that enable the interaction through the terminal.
 
+* [arsh](https://github.com/sekiguchi-nagisa/arsh) - A statically typed scripting language with shell-like features.
 * [Bash](https://www.gnu.org/software/bash/) - (Bourne Again SHell) The most widespread system shell to date.  
 * [Cat9](https://github.com/letoram/cat9) - Cat9 is a user shell script for LASH - a command-line shell that discriminates against terminal emulators, written in Lua.
 * [cosh](https://github.com/tomhrr/cosh) - Concatenative command-line shell.
 * [DASH](http://gondor.apana.org.au/~herbert/dash/) - DASH is a POSIX-compliant implementation of /bin/sh that aims to be as small as possible. It does this without sacrificing speed where possible.
+* [dune](https://github.com/adam-mcdaniel/dune) - A customizable shell that aims to be cozy.
 * [Elvish](https://github.com/elves/elvish) - Elvish is a versatile interactive shell and expressive programming language, combined into one seamless package.
+* [es](https://wryun.github.io/es-shell/) - (extensible shell) shell with first class functions, lexical scope, exceptions, and rich return values, based on Plan9's rc.
 * [Fish](https://fishshell.com/) - "A command line shell for the 90s"; focused on user-friendliness, with powerful autosuggestions, colors, "sane scripting" (w.r.t. to Bash).
 * [Ion](https://github.com/redox-os/ion) - Ion is a modern system shell that features a simple, yet powerful, syntax.
+* [ksh93](https://github.com/ksh93/ksh) - (KornShell) a shell programming language that is compatible with the Bourne Shell in addition and has the major command-entry features of the BSD shell csh.
+* [mksh](http://www.mirbsd.org/mksh.htm) - (MirBSD Korn Shell) an actively developed free implementation of the Korn Shell programming language and a successor to the Public Domain Korn Shell (pdksh).
+* [murex](https://murex.rocks) - An intuitive, typed and content aware shell for the 2020s and beyond.
 * [N-Commodore](https://github.com/psprint/n-commodore) - A novel file manager/shell/command-line, where everything is panelized, greppable and remembered.
 * [Nushell](https://github.com/nushell/nushell) - A modern shell written in Rust, where all data is structured.
+* [Oils](https://github.com/oilshell/oil) - From their README: "Oils is our upgrade path from bash to a better language and runtime!" 
+* [oksh](https://github.com/ibara/oksh) - Portable OpenBSD ksh
+* [PowerShell](https://microsoft.com/PowerShell) - An automation and configuration tool/framework optimized for dealing with structured data, REST APIs, and object models.
+* [Rash](https://rash-lang.org) - A shell language, library, and REPL for Racket.
 * [Reptyl](https://github.com/0ut0flin3/Reptyl) - A cross-platform command line shell that supports execution of commands in natural language.
 * [Spaceship](https://spaceship-prompt.sh/) - Minimalistic, powerful and extremely customizable Zsh prompt.
+* [Tcsh](https://www.tcsh.org) - C shell with file name completion and command line editing.
 * [Twin](https://github.com/cosmos72/twin) - Text mode window environment. A "retro" program for embedded or remote systems, that doubles as X11 terminal and text-mode equivalent of VNC server.
 * [xonsh](https://xon.sh/) - The xonsh shell lets you easily mix Python and shell commands in a powerful and simplified approach to the command line.
+* [Yash](https://magicant.github.io/yash) - Yash
 * [Zsh](http://www.zsh.org/) - Alternative shell designed for interactive use.  
 
 ## <a name="music"></a>Sound and music