Well know apps that have been discontinued recently.
Searx is a free internet metasearch engine which aggregates results from more than 70 search services. Users are neither tracked nor profiled. Additionally, searx can be used over Tor for online anonymity.
Basic word processor bundled with Windows since 1995, offering rich and plain text editing, ribbon interface from Windows 7, and simple formatting features.
Stitcher is a free podcast app, it’s home to all your favorite podcasts and easy to navigate features. Explore shows from NPR, Wondery, WNYC, the New York Times, Earwolf, Exactly Right, and more.
The coding app for beginners. With fun, quick lessons on your phone, the app teaches adult learners to write real JavaScript.
Apollo is a beautiful Reddit client built for fast navigation with an incredibly powerful set of features. Thanks to features like the Jump Bar, fully customizable gestures, and a super-charged Media Viewer, browsing Reddit has never been this amazing.
Fast, easy and fun to stay on top of work & life with your personal assistant Cortana! Bring your smart digital assistant to your phone to help keep track of the important stuff wherever you are, across your devices.
RARBG is a website, founded in 2008, that provides torrent files and magnet links to facilitate peer-to-peer file sharing using the BitTorrent protocol. Its categories include movies, TV shows, games, music, and software.
Neeva is an ad-free search engine that requires a subscription to use. It can be linked to personal accounts like Microsoft Office, Dropbox, or Google. Outside of just searching the web, users are also able to search their personal documents such as emails, presentations, and...
Skyline is an experimental emulator that runs on ARMv8 Android™ devices and emulates the functionality of a Nintendo Switch™ system, licensed under Mozilla Public License 2.0
Parler is a non-biased free speech driven entity. The goal of Parler is to supply the infrastructure for the next generation of social media where content creators are supported for participating. Parler aims to empower users to control their social experience.
Digital Photography Review: All the latest digital camera reviews and digital imaging news. Lively discussion forums. Vast samples galleries and the largest database of digital camera specifications. Reviews for Cameras, Lens, Printers. All about world of digital Photography.
Creating is hard work, we help with the rest. We help you connect with your community so you can turn your passion into a career and earning money.
Discover the most engaging customer experiences with Google Optimize. Test different variations of your website and then tailor it to deliver a personalized experience that works best for each customer and for your business.
Tweetbot is an award-winning, full-featured* Twitter client for the Mac. It has a beautiful interface with light & dark themes, multiple-column support and much more.
Re-imagined from the ground up to be the Mac's most friendly, powerful and modern Twitter client. Twitterrific makes Twitter fun.
An Objective-C IDE for iOS and Mac OS development with a smarter code editor. AppCode is 100% compatible and interoperable with Xcode, with no additional configuration required, and seamlessly integrates with CocoaPods, Reveal application, most popular version control systems...
Zenly is a live map of your friends and family. It’s the most fun way to meet up — or just see what’s up! — so even when you’re apart, you can feel together.
Stadia is Google's new cloud-based gaming platform that allows you to play your favourite hit video games across screens instantly.
Bibliogram is a website that takes data from 
Instagram 's public profile views and puts it into a friendlier page that loads faster, gives downloadable images, eliminates ads, generates RSS feeds, and doesn't urge you to sign up.
Amazon Drive is your hard drive in the cloud. Store your music, videos, photos, and documents on Amazon's secure servers. All you need is a web browser to upload, download, and access your files from any computer.
The beautiful RememBear app is the easiest way to create, secure, and auto-fill really strong passwords across your devices.
Experience an ultra-intuitive interface, a reliable architecture and a powerful feature set that provides quick access and control over your fonts.
Proficonf is a professional video conferencing platform that allows host meetings with up to 250 participants without any downloads or installations.
Hangouts is a messaging app that lets you send and receive messages, photos and more, and even start free video and voice calls – one to one or with a group!
Windows 8 is a operating system that is optimized for tablets, desktops and hybrid devices. It features the new Modern UI (formerly called Metro-Style) that is designed for touchscreen, mouse, keyboard, and pen input.
A graphical web browser developed by Microsoft as part of Windows OS since 1995, reaching peak usage with IE5 and IE6 before declining.
Vanced is a modded version of YouTube with many features such as adblocking, background playback, PiP mode and several other customizable ones.
CTemplar is a security and privacy focused email provider based in Iceland. They use E2EE to keep your conversations private and secure. Their service offers onion address for those who want the best possible privacy and security.
YouTube Go provides a video experience that focuses on offline support, letting you download and share video content locally. Preview videos when offline and share them with nearby friends and download videos to watch later.
TERA is the first true action MMORPG, providing all of the depth of an MMO with the intensity and gratification of an action game. Players fully control their characters using the game's dynamic battle system.
Freeware software enabling multimedia viewing and rich Internet applications through web browsers, discontinued by Adobe in December 2020, replaced by modern web standards.
Google Cloud Print makes printing more intuitive, accessible and useful, by letting you print to your printers from Google Cloud Print-enabled apps on any computer or smart phone.
Point & click to forbid/allow any class of requests made by your browser. Use it to block scripts, iframes, ads, facebook, etc.
Google Play Music, a service available for people who have a Google account, lets people upload their personal music collection and access it instantly on the web.
RDCMan manages multiple remote desktop connections. It is useful for managing server labs or large server farms where you need regular access to each machine such as automated checkin systems and data centers.
Rabbit is about sharing your everyday. Watch your favorite shows with your friends, without being in the same room (or even the same city!). Collaborate with your coworkers when you’re all on the road. Shop together for a birthday present for Mom, then sing her “happy birthday”...
Organizes audio, video, and playlists, streams Internet radio, syncs with devices, manages purchases, imports CDs, supports audiobooks, and runs on Windows or macOS.
Google Travel, formerly Google Trips, is a trip planner service developed by Google for the web. It was originally launched as a mobile app on September 19, 2016, for Android and iOS, which was shut down on August 5th, 2019 and replaced by the new Google Travel web app, which...
YouTube Gaming keeps you connected to the games, players, and culture that matter to you. Featuring videos and live streams with chat — including let's plays, reviews, speedruns, trailers, and more from your favorite gamers and publishers — you can explore the games you care...
Antergos, as its father, 
Arch Linux , is a rolling release distro. It started life under the name of Cinnarch, combining the Cinnamon desktop with the Arch Linux distribution, but the project has moved on from its original goals and now offers...
Blue Coat K9 Web Protection is a content filtering solution for your home computer. Its job is to provide you with a family-safe Internet experience, where YOU control the Internet content that enters your home.
LemonStand Is The eCommerce Platform That's Built For Growth
It helps you rank higher, and generate more sales with industry leading technology and flexibility.
LemonStand is tailor-made for online stores that do over six figures per year in sales, or aspire to. Everything.
Chat with your friends, securely. Cryptocat is free software with a simple mission: everyone should be able to chat with their friends in privacy.
Quick Your Pictures! The best picture viewer/browser/gallery! The best photo gallery and picture browser&viewer in Android, more quick and clear then the lazy stock Gallery, just as millions of users said!
It supports various features:
The Google+ project aims to make sharing on the web more like sharing in real life. Sharing is a huge part of the web, a part that Google+ makes a lot simpler with these features:
SuperSU allows for advanced management of Superuser access rights for all the apps on your device that need root. SuperSU has been built from the ground up to counter a number of problems with other Superuser access management tools.
Comments
How do you find apps that are well-known but discontinued?
Also make sure to add Google Bookmarks
I just saw the list but i found out last night about Xmarks, I was with them for years!
Xmarks is the one I regret.
Maybe you forgot to mention
MPC-HC. Or not.
In this list I add famous apps that are no longer available. The old version released of MPC-HC by mpc-hc.org can be still downloaded from their website. Also the program has been forked by a former developer that is continuing the project with new releases. I have updated our app page with these info:
MPC-HC
Oh, I see. That's basically why I put "Or not." ahead.