With Process Explorer you can see  information about which handles and DLLs processes have opened or loaded.

The Process Explorer display consists of two sub-windows. The top window always shows a list of the currently active processes, including the names of their owning accounts, whereas the information displayed in the bottom window depends on the mode that Process Explorer is in: if it is in handle mode you’ll see the handles that the process selected in the top window has opened; if Process Explorer is in DLL mode you’ll see the DLLs and memory-mapped files that the process has loaded. Process Explorer also has a powerful search capability that will quickly show you which processes have particular handles opened or DLLs loaded.

The unique capabilities of Process Explorer make it useful for tracking down DLL-version problems or handle leaks, and provide insight into the way Windows and applications work.

This free software, VLC (initially VideoLAN Client is a multimedia player  for various audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, mp3, ogg…) as well as DVDs, VCDs, and various streaming protocols. It can also be used as a server to stream in unicast or multicast in IPv4 or IPv6 on a high-bandwidth network.

* It is a free cross-platform media player
* It supports a large number of multimedia formats, without the need for additional codecs
* It can also be used as a streaming server, with extended features (video on demand, on the fly transcoding, …)

Use Wireshark for network troubleshooting, protocol development, and education worldwide.

Wireshark was written by networking experts around the world, and is an example of the power of open source. It runs on Windows, Linux, UNIX, and other platforms. This download is for Windows only.

Wireshark can read live data from Ethernet, Token-Ring, FDDI, serial (PPP and SLIP) (if the OS on which it’s running allows Wireshark to do so), 802.11 wireless LAN (if the OS on which it’s running allows Wireshark to do so) and ATM connections

this software was previously known as Ethereal.