Free alternative to proxycap

"Try WideCap, freeware since 06 May 2009:

WideCap - is system proxifier. It was
created as extended version of
FreeCap program. But WideCap IS NOT a
branch or new FreeCap version.

WideCap is fully functional Winsock
Service and Namespace provider. That
means simply integration into your
network subsystem. Forget about this
ugly FreeCap's injection, needle to
run all programs throught FreeCap,
possible errors and incompatible with
some firewalls and anti-viruses.
WideCap acts as virtual network driver
covering all your TCP/IP activity. No
launchers - just run your program as
usual and work via proxy."

"New Answer :

Bypass Proxy Client

The complete network privacy toolBypass Proxy Client is the complete network privacy tool. It ensures absolute privacy wherever you maybe, preventing would-be snoopers from monitoring your surfing, email, or chatting activity. Put an end to blocking filters, firewalls, and proxies. Surf, chat, read news boards, and get all your email at work, on campus (or in regions/areas that may block controversial websites). This client supports HTTP, FTP,SMTP, POP3, NEWS, and SOCKS4 networking, in addition to a direct TUNNEL-ing feature. Bypass supports most OSes and works with standard HTTP and SOCKS proxies.

OLD Answer :

SocksCap

Automatically enables Windows-based TCP and UDP networking client applications to traverse a SOCKS firewall. SocksCap intercepts the networking calls from WinSock applications and redirects them through the SOCKS server without modifying the original application, the operating system software or drivers.
SocksCap is licensed for non-commercial use"