Screenleap is described as 'Screen share instantly for free using Screenleap. Screenleap makes it really easy to share your computer screen. You can share your screen with as many people as you like with no downloads, account setup, or cost required' and is a Remote Desktop tool in the remote work & education category. There are more than 100 alternatives to Screenleap for a variety of platforms, including Windows, Mac, Linux, Android and iPhone. The best alternative is TeamViewer. It's not free, so if you're looking for a free alternative, you could try Jitsi or Chrome Remote Desktop. Other great apps like Screenleap are AnyDesk, Remmina, DWService and NoMachine.
Jitsi (previously SIP Communicator) is an audio/video and chat communicator with full encryption that supports protocols such as SIP, XMPP/Jabber, ICQ/AIM, Windows Live, Yahoo!, GTalk/Hangouts extensions, as well as OTR, ZRTP, etc.
Remmina is a remote desktop client written in GTK+. Remmina primarily targets system administrators and travelers that need to work with computers remotely in front of either large monitors or tiny netbooks.
DWService is an half (only the client/agent) open source project which offers a service that allows access to remote systems (Windows, Mac, Linux, Raspberry...) using a standard web browser - without any component required on the client side.
VNC is remote access and control software which allows you to view and fully interact with one computer desktop (the "VNC Connect") using a simple program (the "VNC viewer") on another computer desktop or mobile device anywhere on the Internet.
Support customers on a remote computer easily through web-based, on-demand remote support sessions. Set up unattended remote access and manage remote PCs, laptops, mobile devices, and servers effortlessly.
TigerVNC is an advanced VNC implementation. It is based on the fourth generation of VNC. TigerVNC also includes features from the TightVNC and TurboVNC projects. This includes accelerated JPEG compression. TigerVNC supports the latest X.Org X server.