Aptoide is a distributed marketplace for mobile applications which runs on the Android operating system. In Aptoide, unlike the default Google Play Store, there is not a unique and centralized store but each user manages their own store.
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
AppValley allows you to browse through apps of various categories. The apps which you can’t download from Apple Store can be downloaded from AppValley. In fact, AppValley even allows you to have the modified (or tweaked/hacked) version of the app that you want to download.
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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