If you are looking for applications not available in the official App Store, consider these safer alternatives: Focuses on emulators and open-source projects.
Direct-from-safari installations with an extensive built-in repo. PC or Premium Certificate Massive database of customized community IPAs. Final Verdict aptoide ios ipa link
As of now, there is no official, publicly available that works without constant revocations or jailbreaking. If you are looking for applications not available