While various "free" versions of these tools exist, using them on most public servers will result in an immediate ban from anti-cheat systems like VAC or server-side plugins. If you are looking for legitimate ways to improve your HNS/KZ performance without external cheats, you can use these built-in console features and safe server plugins: Safe Movement Features & Commands :

Most pros bind MWHEELDOWN or MWHEELUP to +jump . This makes timing your bhops much more forgiving than using the Spacebar. 3. Mastering the Strafe (The Real Skill)

KZH was designed to automate the most difficult aspects of CS 1.6 movement— strafe jumping, bunnyhopping, and long-jumping

Jumping from a high surface to a lower one and immediately "bouncing" off to maintain speed. 2. The "Cheat-Free" Technical Setup