Mobile Phone Applications
After searching for an old version of an old app, I thought that saving mobile phone applications should be done to ensure their preservation.
Android Applications
http://android.stackexchange.com/questions/14910/where-can-find-older-versions-of-apps
-> F-Droid: https://f-droid.org/ (Repository: https://f-droid.org/repository/browse/)
-> Freeware Lovers: http://www.freewarelovers.com/ (Also BlackBerry, Palm OS, Windows Mobile, Symbian)
-> Android Drawer: http://www.androiddrawer.com/
-> APKMirror: http://www.apkmirror.com/
-> APKTop: http://www.papktop.com/
-> AppzApk: http://androidsandwich.com/
-> 1Mobile: http://www.1mobile.com/
-> XeeApk: http://xeeapk.com/ (Dead?)
-> APK4Fun: http://www.apk4fun.com/
-> All Download APKs: http://www.alldownloadapk.com/
iOS Applications
-> FindOldApps: http://findoldapps.com/
BlackBerry Applications
Palm OS Applications
Windows Mobile Applications
Symbian Applications
-> Opera Mobile Store: http://symbian.apps.opera.com/
J2ME Applications
-> Opera Mobile Store: http://java.apps.opera.com