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UltraVNC

is a powerful, easy to use and free – remote pc access softwares – that can display the screen of another computer (via internet or network) on your own screen. The program allows you to use your mouse and keyboard to control the other PC remotely. It means that you can work on a remote computer, as if you were sitting in front of it, right from your current location.

VNC, the Remote Frame Buffer protocol (RFB) allows a desktop to be viewed and controlled remotely over the Internet. A VNC server must be run on the computer sharing the desktop, a VNC client must be run on the computer that will access the shared desktop.

UVNC Software Products
UltraVNC
UltraVNC SC
PcHelpWareV2
uvnc2me

GPL
Yes
Yes
No
No

Free
Yes
Yes
Yes
Yes

Bundling (1)
No
No
Yes
Yes

NAT (2)
Yes (4)
Yes (4)
Buildin
Buildin

NAT2NAT (3)
Via Repeater (5)
Via Repeater
Buildin
Buildin

Network Protocol
TCP
TCP
UDP
UDP

Access
IP Address
IP Address
Access Code
Access Code

Encryption
Plugin
Plugin
Buildin AES
Buildin AES

Key
Plugin
Plugin
256bit
256bit

Password
8 chars (6)
8 chars
32 chars
8 chars (7)

Chat
Yes
Yes
Yes
Yes

Filetransfer
Yes
Yes
Yes, via chat
Yes, via chat

Service
Yes
No
Yes
No

Session (8)
Console/Current
Console/Current
Console/RDP (9)
Console/Current

Connection Manager
No
No
Yes
No

Difficulty
5
8
3
1

(1) GPL doesn’t allow bunding of GPL and non GPL software. If you want to use UltraVNC or UltraVNC SC in combination with a commercial software you need to create a seperate installer or let your installer download UltraVNC. PcHelpWare or uvnc2me can be bundled without restriction.
(2) One site is connected to the internet the other is behind a nat router.
(3) Both sites are behind a nat router.
(4) The site behind the nat router need to initiate the connection.
(5) A seperate application “repeater” is needed. Both sites make an outgoing connection to the repeater and the repeater cross the data.
(6) Using the encryption plugin you can use a longer password or a predefined key.
(7) The password is generated for each session, access code is fixed.
(8) Runing as service you always clone the console, if started as application you clone the current session (console/RDP).
(9) PcHelpWare has a preconnect screen that allow to select a RDP or the console session.