The best MLM (Multi-Level Marketing) system for WordPress depends on your specific needs, but here are some of the top plugins:

1. WP MLM Plugin
Supports Unilevel, Binary, and Matrix MLM plans

Member dashboard and admin panel

Payout and commission management

WooCommerce integration

2. Ultimate Affiliate Pro
Supports MLM structures like Unilevel and Matrix

Recurring commissions and performance rewards

WooCommerce and Easy Digital Downloads integration

3. WP MLM Software by WPBinaryMLM
Best for Binary MLM structures

Genealogy tree and commission tracking

E-wallet and payout options

4. AffiliateWP with MLM Add-on
Primarily an affiliate plugin with MLM capabilities

Tracks referral commissions and downline earnings

Compatible with WooCommerce and MemberPress

5. Multi-Level Referral Affiliate System
Customizable MLM structures

Real-time reporting and downline tracking

Supports PayPal and Stripe payouts

If you need a full MLM platform, WP MLM Plugin or WPBinaryMLM are great choices. If you need a hybrid MLM-affiliate system, Ultimate Affiliate Pro or AffiliateWP work well.