From time to time you may find yourself in need of a quick way to share your screen remotely. Sharing your screen with students can be a good way to walk them through an application or give them a virtual presentation. Likewise, screen sharing can be useful for professional development in which you’re introducing colleagues to the ins and outs of program. Here are three free options for screen sharing.

Join.me is a free service offered by Log Me In. Join.me allows Mac and Windows users to quickly share their screens with each other and work together. To use Join.me you do need to download the Join.me client. Once you’ve downloaded the client you can start sharing your screen with anyone you like. Just give your nine digit access number to your collaborators to give them access to your screen and to converse with you.

Screen Leap is a free screen sharing service. To share your screen using Screen Leap just visit the site, click “share your screen,” enable the Java applet, and send the sharing code to the person you want to view your screen. The person receiving your invitation code will be able to see your screen when you have Screen Leap activated.

Google+ Hangouts offer an easy way to share your screen with other Google+ users. To get started just go to Hangouts.google.com then launch your video Hangout. Invite people to join your Hangout. Once they have joined you can share your screen by selecting the screen sharing option from the menu in the upper-right corner of your Hangout screen.