I had nothing to do so i just googled around a bit.
<a href='ftp://ftp.ngz-network.de/pub/hostings/TheDoenerKing/tools/sprview.zip' target='_blank'>Sprite Viewer</a> : Use this program to view all kinds of sprites in Half-Life
<a href='ftp://ftp.ngz-network.de/pub/hostings/TheDoenerKing/tools/spritexplo20.zip' target='_blank'>Sprite Explorer</a> : Another Viewer Tool , didnt try it but it should be better than sprite viewer , it has the possibility to view the Sprites inside pak0.pak files.
<a href='ftp://ftp.ngz-network.de/pub/hostings/TheDoenerKing/tools/sprwiz.zip' target='_blank'>Sprite Wizard</a> : And finaly use this one to create your own sprites.
Comments
<a href='ftp://ftp.ngz-network.de/pub/hostings/TheDoenerKing/tools/sprview.zip' target='_blank'>Sprite Viewer</a> :
Use this program to view all kinds of sprites in Half-Life
<a href='ftp://ftp.ngz-network.de/pub/hostings/TheDoenerKing/tools/spritexplo20.zip' target='_blank'>Sprite Explorer</a> :
Another Viewer Tool , didnt try it but it should be better than sprite viewer , it has the possibility to view the Sprites inside pak0.pak files.
<a href='ftp://ftp.ngz-network.de/pub/hostings/TheDoenerKing/tools/sprwiz.zip' target='_blank'>Sprite Wizard</a> :
And finaly use this one to create your own sprites.
-Paladin