What is the demo that you require ? Please describe. Add every non CORS from https://github.com/chubin/awesome-console-services as an demo example

awesome-console-services

A curated list of awesome console services (reachable via HTTP, HTTPS and other network protocols). Structured data of the list (kept in sync) is in structured.yaml.

IP Address
Geolocation
Text Sharing
URL Shortener
File Transfer
Browser
Tools
Monitoring
Weather
News
Information boards
Map
Money
Documentation
Dictionaries and translators
Generators
Entertainment
Scripts
Clients

IP address

Inline

curl l2.io/ip
curl https://echoip.de
curl ifconfig.me
curl ipecho.net/plain
curl -L ident.me #API
curl -L canihazip.com/s
curl -L tnx.nl/ip
curl wgetip.com
curl whatismyip.akamai.com
curl ip.tyk.nu
curl bot.whatismyipaddress.com
curl curlmyip.net
curl api.ipify.org
curl ipv4bot.whatismyipaddress.com
curl ipcalf.com

New line

curl ipaddy.net
curl eth0.me
curl ipaddr.site
curl ifconfig.co
curl ifconfig.pro
curl curlmyip.net
curl ipinfo.io/ip
curl icanhazip.com
curl checkip.amazonaws.com
curl smart-ip.net/myip
curl ip-api.com/line?fields=query
curl ifconfig.io/ip
curl -s ip.liquidweb.com
curl ifconfig.es
curl ipaddress.sh
curl 2ip.ru

DNS

dig @1.1.1.1 whoami.cloudflare ch txt +short (IPv4)
dig @2606:4700:4700::1111 whoami.cloudflare ch txt -6 +short (IPv6)
dig @ns1.google.com o-o.myaddr.l.google.com TXT -6 +short (IPv6)
dig @ns1.google.com o-o.myaddr.l.google.com TXT -4 +short (IPv4)
dig resolver.dnscrypt.info TXT +short
curl https://dnsjson.com/resolver.dnscrypt.info/TXT.json
curl -L https://edns.ip-api.com/json
curl 'api.hackertarget.com/zonetransfer/?q=zonetransfer.me' - DNS Zone Transfer

JSON only

curl httpbin.org/ip
curl wtfismyip.com/json
curl -L iphorse.com/json
curl geoplugin.net/json.gp
curl https://ipapi.co/json
curl -L jsonip.com
curl gd.geobytes.com/GetCityDetails
curl ip.jsontest.com

Geolocation

curl ipinfo.io/8.8.8.8 or curl ipinfo.io/8.8.8.8/loc
curl ip-api.com or curl ip-api.com/8.8.8.8
curl ifconfig.co/country or curl ifconfig.co/city or curl ifconfig.co/country-iso or http ifconfig.co/json
curl ifconfig.es/geo or curl ifconfig.es/json or curl ifconfig.es/country or curl ifconfig.es/code or curl ifconfig.es/city or curl ifconfig.es/latitude or curl ifconfig.es/longitude

Text Sharing

echo "Hello world!" | curl -F 'f:1=<-' ix.io
echo "Hello world!" | curl -F file=@- 0x0.st
echo "Hello world!" | curl -F 'clbin=<-' https://clbin.com
echo "Hello world!" | nc termbin.com 9999
echo "Hello world!" | curl -F 'sprunge=<-' sprunge.us
echo "Hello world!" | curl -H "content-type: text/plain" -d @- https://textdb.dev/api/data/unique-id-for-my-text
curl https://patchbay.pub/your-custom-path -d "Hello world!" and curl -s https://patchbay.pub/your-custom-path

URL shortener

curl -s tinyurl.com/api-create.php?url=<link>
:no_entry_sign: curl -F shorten=<link> https://ttm.sh
curl https://is.gd/create.php?format=simple&url=<link>
curl -F shorten=<link> https://0x0.st

File Transfer

curl --upload-file <file> transfer.sh/<filename>
curl --upload-file <file> filepush.co/upload/<filename>
curl -F file=@<file> https://ttm.sh
curl https://patchbay.pub/your-custom-filepath.exe --data-binary @<file> and curl -LO https://patchbay.pub/your-custom-filepath.exe
nc oshi.at 7777 < <file> or curl https://oshi.at -F f=@<file>
curl -F file=@<file> https://0x0.st
curl -F file=@<file> https://api.anonfile.com/upload

Browser

:no_entry_sign: ssh brow.sh

Tools

curl qrenco.de/STRING or echo STRING | curl -F-=\<- qrenco.de — create QR-code for a string (chubin/qrenco.de)
curl "http://c.docverter.com/convert" -F from=html -F to=pdf -F "input_files[]=@your-file-name.html" -o "output-file-name.pdf" - convert a document (source)
curl -s "https://decapi.me/youtube/latest_video?user=NPR" - title/URL of latest upload from indicated YouTube channel
curl -s "https://decapi.me/twitter/latest?name=NPR" - last tweet from indicated account
curl -s "https://decapi.me/twitch/uptime?channel=IGN" - check if indicated twitch channel is online
curl -s "https://httpbin.org/delay/4" - HTTP request and response Service (e.g. send response after 4 seconds)
curl -s "https://urlecho.appspot.com/echo?body=Hello+World" - HTTP response defined in the request parameters
curl -s "https://urlreq.appspot.com/req?method=GET&url=https://l2.io/ip" - HTTP proxy makes new requests based on input parameters
curl -s "https://api.hackertarget.com/nmap/?q=93.184.216.34" - TCP port scan using NMAP
curl -s "https://api.hackertarget.com/pagelinks/?q=msn.com" - Extract all links from a page
curl -s "https://api.hackertarget.com/whois/?q=google.com" - Whois lookup
curl -s "https://jsonplaceholder.typicode.com/users" - Useful tool to retrieve fake api data

Cryptography

curl https://ja3er.com/search/535886c8d0a1b14f02298967bb990171 - SSL fingerprint search

Monitoring

curl ping.gg

Weather

curl wttr.in or curl wttr.in/Berlin — the right way to check the weather
finger oslo@graph.no
nc rainmaker.wunderground.com 3000 (also works with telnet)
curl https://tgftp.nws.noaa.gov/data/observations/metar/stations/KAAO.TXT - METAR from the specified ICAO

News

curl getnews.tech/world+cup — fetch the latest news
curl rate.sx - for exploring (crypto)currencies exchange rates
gopher://gopher.leveck.us:70 - news aggregator
gopher://gopherddit.com:70 - reddit
ssh redditbox.us — reddit in terminal (ssh + text browser)
gopher://hngopher.com:70 - hacker news
:no_entry_sign: curl wrk.ist — fetch the latest remote jobs / gigs on the IT market

Information boards

:no_entry_sign: curl http://frcl.de/gulasch — Gulaschprogrammiernacht 2019 Fahrplan
gopher://gopherpedia.com:70 - wikipedia

COVID-19

curl https://corona-stats.online
curl -L covid19.trackercli.com
curl snf-878293.vm.okeanos.grnet.gr - Covid-19 statistics for your country

Map

telnet mapscii.me — show a zoomable world map

Money

curl rate.sx — get cryptocurrencies exchange rates
:no_entry_sign: curl moneroj.org — get Monero exchange rate
:no_entry_sign: curl cmc.rjldev.com — get coinmarketcap top 100 cryptocurrencies
nc ticker.bitcointicker.co 10080 — get BTC/USD exchange rate (also works with telnet)
curl https://stonks.icu/amd/msft get stock visualizer and tracker
curl terminal-stocks.shashi.dev/:ticker - get stocks prices and information for provided yahoo ticker
ssh cointop.sh - cryptocurrency tracking TUI (source)

Documentation

curl cheat.sh — UNIX/Linux commands cheat sheets using curl (chubin/cheat.sh)
curl 'https://api.hackertarget.com/subnetcalc/?q=192.168.1.0/24' Subnet calculator
gopher://telcodata.us:70 - NPA/NXX Lookup
gopher://gopher.floodgap.com/1/world - all known gopher servers

Dictionaries and translators

curl 'dict.org/d:command line'

Generators

git commit -m "$(curl -sk whatthecommit.com/index.txt)" — generate random commit message
curl "https://www.random.org/integers/?num=1&min=1&max=100&col=1&base=10&format=plain&rnd=new" - generate random number
curl -H 'Accept: text/plain' https://foaas.com/cool/:from — fuck off as a service
curl pseudorandom.name — generate a pseudo random (American?) name (treyhunner/pseudorandom.name)
:no_entry_sign: curl -s https://uinames.com/api/?region=france\&amount=25 | jq '.[] | .name +" " + .surname' — generate 25 random french names
curl https://icanhazdadjoke.com — random jokes
curl givemeguid.com - guid
nc towel.blinkenlights.nl 666 - IT excuses (also works with telnet)
curl -s 'https://api-inference.huggingface.co/models/distilgpt2' --data-raw '"what is the meaning of life?"' | jq '.[].generated_text' - generate text using the GPT2 AI model from a seed string

Entertainment and Games

curl https://asciitv.fr — watch Star Wars in terminal via curl (source)
nc towel.blinkenlights.nl 23 — watch Star Wars in terminal via netcat (also works with telnet)
ssh chat.shazow.net — chat over SSH (shazow/ssh-chat)
ssh chat@ascii.town — SSH chat client (source)
curl parrot.live — display an animated party parrot (hugomd/parrot.live)
curl byemck.atulr.com — display animated goodbye message for colleagues (master-atul/byemck)
nc rya.nc 1987 — get Rick Rolled (also works with telnet)
curl node-web-console.glitch.me — watch an emoji race (source)
curl ascii.live/forrest - run Forrest, run!
curl ascii.live/nyan - watch Nyan Cat
curl https://poptart.spinda.net — fullscreen colorized Nyan Cat
gopher://fld.gp:70 - gopher resources / news / weather / entertainment
gopher://mozz.us:70 - games, drink recipes, and other
gopher://port70.net/1board/b - 4chan
ssh torus@ascii.town - collaborative ASCII art project (source)
telnet 1984.ws 23 — BBS (BBS list here)
ssh vtm@netxs.online - demo the "Monotty" text-based desktop environment (source)
curl e.xec.sh — seach and display gifs in your terminal

Telnet/SSH-based games:

ssh sshtron.zachlatta.com ~> snake game; play with AWSD keys
ssh netris.rocketnine.space — multiplayer tetris
ssh play@ascii.town — 2048, snake, and freecell (source)
ssh gameroom@bitreich.org - 11 arcade games
ssh play@anonymine-demo.oskog97.com -p 2222 — guess free minesweeper; Pass: play
ssh twenex@sdf.org — play various games including checkers
ssh intricacy@sshgames.thegonz.net - Competitive puzzle; password: intricacy
ssh simulchess@sshgames.thegonz.net - Multiplayer Chess; password: simulchess
ssh pacman:pacman@antimirov.net - Pacman; password: pacman
ssh lagrogue@sshgames.thegonz.net - Roguelike; password: lag
ssh ckhet@sshgames.thegonz.net - Khet; password: ckhet
ssh slashem@slashem.me - nethack and others
ssh rodney@rlgallery.org - rogue; password: yendor
ssh pong.brk.st - singleplayer pong
ssh tty.sdf.org - requires you to make an account first
nc aardmud.org 23 — MUD (MUD list here, also works with telnet)
nc freechess.org 23 — Chess Game (also works with telnet)
nc igs.joyjoy.net 6969 - play/watch the game of Go (also works with telnet))
nc fibs.com 4321 - multiplayer backgammon (also works with telnet)
telnet dungeon.name 20028 - infinite cave adventure
telnet milek7.gq — games: Pong, Break out, Tetris
telnet mtrek.com 1701 — Star Trek
telnet decwars.com 1701 — Multiplayer Star Trek
telnet telehack.com
telnet multizork.icculus.org — Multiplayer Zork

Scripts

Useful scripts, that can be run with just one line of code, but where, still local execution is necessary.

curl -s https://raw.githubusercontent.com/sivel/speedtest-cli/master/speedtest.py | python -

Clients

At least one of these clients, that you need to access these services, is installed on almost every UNIX/Linux system.

ignatandrei / BlocklyAutomation

https://github.com/chubin/awesome-console-services #8