Speek is described as 'At Speek we’re dedicated to bringing you super simple conference calling with no dial-ins, pins or downloads. Participants click the Speek link to start or join a call from their phone, web or mobile browser' and is an app in the Social & Communications category. There are more than 100 alternatives to Speek for a variety of platforms, including Windows, Android, iPhone, Mac and Online / Web-based. The best alternative is Telegram, which is free. Other great apps like Speek are Element (Free Personal, Open Source), Discord (Freemium), Jitsi (Free, Open Source) and Skype (Freemium).
MobileVOIP is a free cheap calls app which lets you make (free) national or international mobile voip calls directly from your iPhone. You can save on your Mobile Phone costs by simply installing the MobileVOIP app and start making cheap calls.
Voptop offers secure and anonymous telephony, instant messaging, file transfer and screen sharing/recording. The Voptop-network is a “peer to peer”-network, which is built by using all registered voptop clients.
Spreed is the worldwide unified web conferencing service offering integrated web and telephone conferencing. It is based on Flash Player. Free service includes 3 attendees and max 1.5h meetings. Single events or monthly service can be purchased.
TrueConf Server is used by 5000 companies around the world connecting thousands of workplaces and conference rooms. The server is specially designed to work in your corporate network. Deploying TrueConf Server takes only 15 minutes!