Tools:

List of Tools/Applications/Drivers that may or maynot work with Hauppauge WinTV-PVR.
I Don't know what you have then check out this place
Bttv TV, Video and Radio card Gallery (and there more).

Scheduler
Kneeo jppPvr Scheduler
CTpvr Scheduler
TVLibrary
PVR Advanced Scheduler
PZSchedule
Dcline1701's WinTV Program Scheduler
WinTVZilla
WebShifter
DABDig (Note for WinTVCap or WinTV2000)
Bitrate Scheduler

PVR or DVR Applications
SageTV
SageTVRecoder (Only 250/350 is supported)
SnapStream Media BeyondTV
TVedia (Best use with a REALmagic Xcard)
GB-PVR
ChrisTV
WinVodio
Digiguide Live TV
CTpvr
J.River Media Center "only partially supported"
Got All Media
K!TV Beta PVR Hardware Encoder

Other tools
WinTVCap & WinTvOut(350) by KevinKiller
WinTVCap Start
WinTVCap32
ViewPVR250
Prefilter Tweak ver 1.0
NanoFix 1.1.0.1215
MPEG Header Repair (MPEG subsequent file fix)
hcwPP2Util (This allow you to set Temporal level)
WinTVSel (This more for new PVR 250/350 with a A/V header)
Amontillado Hauppauge Tweak Tool (This for WinTV2000, 150/250/350/500)
sub GBRecord
FreqShifter
Bitrate Calculator (Scroll to bottom of the page)
Orb Networks Stream Tool

KnoppMyth
MythDora
MythTV
Freevo
IvyTV a Linux iTVC15-16 and CX23415-16 Driver
(WinTV-PVR 150/250/350/500, AVerMedia M179, Yuan MPG160/MPG600, etc)
Video for Linux resources
IvyWiki lots very useful information and resources

Linux USB PVR Driver
Linux USB2 PVR Driver

EmperoarTV

Applications
SageTV
GB-PVR
MVPMC
MediaMVP SHOUTcast Station Updater

TV Skin mods
MediaMVP BTV3 Interface
See SHSPVR Forum

Applications
Yahoo! GO Acquires Meedio
Media Portal
Xlobby
Mimic "BeyondTV FrontEnd"

Generic Universal Drivers
inLab BT8xx WDM drivers
Illusion & Hope BT8xx WDM drivers

Mics Tools
VFW->WDM wrapper

TV Applications
DScaler
MyTV
ATV2000
BorgTV
TVMonkeys (Not yet Released)
TVActive
JTV
ChrisTV
K!TV XP
ExoTV

PVR or DVR Applications
nanoCOSMOS nanoDVR
Snapstream PVS
Ravisent CinePlayer DVR (Formerly WinVCR)
CyberLink PowerVCR II
InterVideo WinDVR
Honestech TVR
Honestech DVR
MsDVR

Remote Control Applications
IR Assistant
Girder
DirecTV Serial Control Utility
JTV Remote
BT Remote
NetRemote
WinLIRC
ARC2000
IR-Control for WinTV (Black Remote only)
WinTV Remote Menu from Mike (scag) see forum for feedback on it
WinTVIR which IRremote.ini Editor made by Dimitris (capthookb)
RemoteConfigur which IRremote.ini Editor made by David Brinton (Omatase)

Video Capture Applications
VirtualDub
add-on - VDstart
add-on - VDstart Pro
add-on - VirtualDVR
add-on - VirtualDub-MPEG2 mod
iuVCR
TheFlyDS
Video Capturix 2000
CamSnap
Video Live
FreeVCR
AVIIO

Radio Applications
Radiator
FM Control
AFM2000
VCRadio
OlegON Radio
TunerFX
FMBox
X-Ripper
FMTuner
Axife FM Player

MPEG Mediator
MPEGTool Mirror1 or Mirror2
DVTools
PVAStrumento, MPEGanalizzatore, AVestensione for Womble Multimedia MPEG2VCR
VideoCD 2.0 Toolkit (v1.0)
bbMPEG
FlasKMPEG
Bitrate Viewer
TMPGEnc
MPEGed
Vidomi
MpegAN "You need this SystemDLL"
Elecard MPEG2 Decoder
Easy Video Splitter
Easy Video Joiner
Cuttermaran
WinMPG Video Convert

Know of a 3rd party app not listed or like on add email me the ULR.