I am a fan of TeamViewer which is a software for sharing information among various computers, mobiles. It is free of cost software & also it has paid version with some additional features. This software can be connected to any server or PC within few seconds in all over the world. This software consume less space in the disk and it is very easy to handle.
When we install in Pc, it gives permanent ID and password. It also has android app which very good. You can do business meeting through teamviewer. Whenever we need to connect with other we just have to enter password. It is very useful for people who need help from techy, family, friends for solving problems is PC. You can also do video and audio talk as well. But one disadvantage is that through teamviewer any hacker can install infected files in your system to hack your all Pc datas.