CPU-Z is free program for showing technical information about user's PC. Program defines technical characteristics of CPU, videocard, motherboard and RAM.
Developer: CPUID.
Licence: freeware.
Supported OSes: 32- and 64-bit Windows XP, Vista, 7; 32-bit Windows 95, 98, Millenium, 2000.
Size: 0.9 and 1.6 MB 32- and 64-bit versions correspondingly.
Program gathers following data:

• CPU:
  • Name and number.
  • Core stepping and process.
  • Package.
  • Core voltage.
  • Internal and external clocks, clock multiplier.
  • Supported instruction sets.
  • Cache information.
• Mainboard:
  • Vendor, model and revision.
  • BIOS model and date.
  • Chipset (northbridge and southbridge) and sensor.
  • Graphic interface.
• Memory:
  • Frequency and timings.
  • Module(s) specification using SPD (Serial Presence Detect): vendor, serial number, timings table.
• System:
  • Windows and DirectX version.

Screenshots:
Download CPU-Z 1.64 x32.

Download CPU-Z 1.64 x64.
All CPU-Z versions.

Comodo PC TuneUp is program for optimization and setting OS. Also, can to irretrievable delete files, including those that doesn't deletes with usual method.
Developer: Comodo Group.
Licence: freeware.
Supported OSes: 32- and 64-bit Windows XP, Server 2003, Vista, 7.
System requirements: 32 MB RAM, 20 MB free disk space.
Size: 14 MB.
Features:

• Fix critical Windows errors like errors with starting PC, turning off, running applications and read/write data on HDD.
• Scan and clean of malware, viruses and spyware.
• Disk cleaning from unnecessary files and logs, temporary files and reporting errors files created by Windows and other applications.
• Improving security Windows settings.
• Fast booting by turn off unnecessary startup programs and optimize perfomance of registry file by its defragmentaion.
• Optimize and fix registry.

Screenshots:

Download Comodo PC TuneUp x32/x64.
Latest version of program: http://pctuneup.comodo.com/.

ApexDC++ is P2P client for exchange files, reworked StrongDC++ with another GUI and smiles. Also, program support work with plugins.
Developer: ApexDC++ Development Team.
Licence: GPLv2.
Supported OSes: 32- and 64-bit Windows 7, Vista, XP, Server 2003, Server 2008, 8.
Language: Multilingual (translations page).
Size: 13 MB.
Features:

• Peer Guardian support.
• Automatic settings of active mode.
• Formating chat support (bold, italic, underline).
• Superseed.
• Customizable GUI.
• Password protection in tray.
• "Away" message show when need.
• Termless user ignore.
• Settings for each hub separately.
• Speed limits.

Screenshots:

Download ApexDC++ x32&64.