@kristinjackvony has created a wonderfully simple app to practice API/UI (or both!) automation, that I think deserves to be added to the list:-
https://thinking-tester-contact-list.herokuapp.com/
Here’s her blog post explaining the site:- New API and UI Test App! – Think Like a Tester
It could be as simple as a very famous website like www.google.com ! 
Anyone interested in API testing could try https://restcountries.eu
demo.opencart.com - e-commerce demo website
Alan Richardson has shared a whole load of things he’s created to help practice on. Cool!
Hi Everyone, I’ve been revisiting this thread from time to time whenever I wanted something to practice or demonstrate on.
But I’ve been looking for mobile applications recently to demonstrate how to get logs related to crashes and API calls, and this thread can benefit from some mobile apps as well.
It was difficult to find such apps as I was looking for Apks released for debugging and not for store release
after looking for hours on Github, I was able to find this app called Susi.AI
while it’s not intended for practicing on, but it was the closest thing I can get as the developer created an apk for debugging so I can get meaningful logs.
Does anyone have any similar apps?
@rightsaidjames recently shared this over in the MoT Slack.
GitHub - TheJambo/ToDoInterviewTest: Interview Test using a To Do List, which is hosted here: To Do List
Might be a niche option. I built a basic site that resembles a GOV.UK service. I made it to have something gov-ish when I worked in the civil service.
It uses components from the gov.uk design system, so the building blocks are realistic. They provide different UI options, in a simple flow. It doesn’t have any validation, or do anything with the data you input.
You can clone and run the project locally or just use the hosted version.
@andreeaqa recently shared Find Bugs.
https://qa-practice.netlify.app/
A great testing playground with common web elements, buggy forms and Ecommerce e2e flows (adding products to cart, quantity, login, logout, etc), or REST API / GraphQL docker applications
Thanks for sharing, @iamrv.
I’ve added it to this wiki page:
Please remove https://phptravels.org/ from the list. The owner of the website told me he does not allow testing on his website.
Newbie to the site. Let me play thread necromancer for a moment.
I see a lot of useful stuff here but it all seems to be remote hosted sites, APIs etc. (please rub my nose in it if I missed what Im looking for)
What I am looking for a is a project that can be used for testing that is deployable. Github has lots of stuff but its a bewildering array of half done…stuff. What Im looking for is a testable product (web front end, application layer, data layer, etc) that I can copy/fork in order to build practice tests and CI/CD, code coverage, etc around.
Does anyone have a likely direction to point me in?
Im replying to myself because I didnt quickly find an edit 
I eventually went back through the thread (always a good idea when there is no response…it might indicate you missed something obvious…) and I found the link to the Wiki and in it is a github link to a repository that contains what I think I will need. Nice job on that wiki.
I’ve been working on an up to date practice app for API Testing at https://apichallenges.eviltester.com
It has 3 APIs to practice with online. Lots of documentation on how to test APIs and I include a set of recommended practice apps and sites. I’m working through the list myself so that it doesn’t just list the apps, it also has some documentation, exercises and observations from my own practice session on the sites.
Might be worth adding to the practice sites list article here 75+ Testing Practice Websites to Master Software QA in 2024 | Ministry of Testing
I used these sites particularly for UI Automation as it is open-source which is designed for testing purposes:
https://opensource-demo.orangehrmlive.com/web/index.php/auth/login
Used this for UI automation demo : https://ecommerce-playground.lambdatest.io/
CrAPI for API security demo
Also here is the entire list :
Happy Practicing 
I recently did a demo using: GitHub - suriya-mca/pimify: Pimify is an open-source product information management software built on the simple stack of Django and SQLite.
Open source projects like these can be a great source of learning not just automation principles, but open source contributions, git management (I learnt git conflict resolving) and a bit of stuff about the web development framework too.
This one is pretty good for practice: GitHub - testsmith-io/practice-software-testing: (Angular) Application / (REST) API / Swagger used to practice software testing.
An angular UI with REST API. Can be run locally in Docker and has a web-hosted version