Vidku!

WhatsApp Messenger is a cross-platform mobile messaging app which allows you to exchange messages without having to pay for SMS. WhatsApp Messenger is available for iPhone, BlackBerry, Android, Windows Phone and Nokia and yes, those phones can all message each other! Because WhatsApp Messenger uses the same internet data plan that you use for email and web browsing, there is no cost to message and stay in touch with your friends.

Facebook Messenger is a faster way to message. Reach friends right on their phones, get and send messages fast, message everyone at once and more.

Snapchat is the fastest way to share a moment with friends.

Coub is YouTube for video loops. You can take any video, trim the best part, combine with other videos, add soundtrack. It might be a funny scene, movie quote, animation, meme or a mashup of multiple sources.

Group messaging platform owned by Microsoft. It's absolutely free, whether you're talking to a group of friends, or texting with one person. Best of all, it works on nearly every phone, via push or SMS. With GroupMe, it's easy to reach anyone, anytime, anywhere.

Beme is the simplest and most unfiltered way to share your personal experience. Instantly capture real moments from the world around you with a simple gesture and without interruption. Get a global view of how friends, family and interesting people from places near and far honestly live their lives, and send them genuine reactions as you watch along.

Tribe is the easiest way to message. Just press and hold to record a message. Release to send.

Open source instant messaging server and clients. Backend in pure Go (license GPL 3.0), client-side binding in Java for Android and Javascript (license Apache 2.0), persistent storage RethinkDB. JSON over websocket (long polling is also available). Tinode is meant as a replacement for XMPP. Overall it's a lot like open source WhatsApp or Telegram.

Provides free photo upload and hosting integration for forums. Free picture hosting and photo sharing for websites and blogs.