Cydia is a Debian APT package manager that lets you download tweaks and apps that haven't been approved by Apple for your jailbroken iPhone, iPad and iPod Touch, via repositories.
On December 13, 2018 Saurik has announced that the Cydia Store is shut down because of a bug with Paypal and lack of funds. He recommends to remove the saved Paypal info from the Cydia account and assures the users that he intends to maintain the ability to download existing packages. https://www.reddit.com/r/jailbreak/comments/a5wfq9/news_andrew_wiik_recommend_that_everyone_removes/ebpur5a/?context=1
Cydia vs Apple App Store opinions
This is not really for apps, it is more for tweaks to your device, but does not provide many actual apps.
the user can add and remove sources (repositories) to check for apps
Cydia is iOS alternative cuz when you jailbreak your iOS you will have cydia
iNoJB, formerly known as "iNoCydia", is a Cydia alternative made by Colton, It has many tweaks as well as apps from the Emu4iOS Store that require no Jailbreak or PC to install. As of version 2.Bundleware
It contains several ads and phishing links too
iNoJB vs Apple App Store opinions
Product Hunt is a curation of the best new products, every day. Discover the latest mobile apps, websites, and technology products that everyone's talking about.
Product Hunt vs Apple App Store opinions
this has nothing to do with the app store
This has nothing to do with the App Store, because it is not for downloading apps.
While the Apple App Store is a distribution platform for iOS Product Hunt is a generic website to hype any kind of stuff.
Easily find more sites like those you like. Similar Sites helps you find related sites and alternatives based on community recommendations and computer analysis.
Its main sections are Windows, Mac, Mac PPC, Linux, Games, Handheld (mobile software), Drivers, Mobile, Webscripts, and News. It also covers technology, science, health and entertainment topics from both external and in-house sources, and it provides software and game reviews.
A web based Application Aggregator. Support all major platforms: Android, iOS, macOS, Windows, Steam, Xbox, PlayStation, Nintendo.
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GetJar vs Apple App Store opinions