weeki is described as 'Weeki is a free messaging app available for Android phones and other smartphones depending on the available network (3G, 4G or wifi) to allow you to send messages and call your friends and family'. There are more than 100 alternatives to weeki for a variety of platforms, including Android, iPhone, Windows, iPad and Android Tablet. The best alternative is Telegram, which is free. Other great apps like weeki are Signal (Free, Open Source), Element (Freemium, Open Source), Jitsi (Free, Open Source) and Jitsi Meet (Freemium, Open Source).
Cross-platform - Get closer to everyone you love with simple, high-quality video calling on iOS and Android. Make one-to-one calls - See who’s already available to connect on Duo or invite a friend to join.
ICQ is one of the oldest instant messengers. First developed by the Israeli company Mirabilis, sold to AOL, sold again and currenly owned by the Russian "mail.ru" group (known for one of the largest social networks).
FluffyChat is an open, nonprofit and cute matrix messenger app for Ubuntu Touch, Android and iOS. Open Opensource and open development where everyone can join. Nonprofit FluffyChat is donation funded. Cute ? Cute design and many theme settings including a dark mode.
A spin-off of the popular Jabber/XMPP client Conversations with automatic contact discovery. Sign up with your phone number and Quicksy will automatically—based on the phone numbers in your address book—suggest possible contacts to you.