The hldstoolz331_sys.zip file you have requested: Tools and Utilities / Server / Half-Life Dedicated Server ToolZ v3.3 - 1.35mb is not available. Perhaps try browsing all files for the game Half-Life and upload any files you want to share or are missing. This is the only information we could locate:
HLDS Toolz is a full HLDS utility. It lets you quickly hide and rename servers, edit CFG files, edit the mapcycle.txt, and edit the motd.txt. It also has full MOD support.