Here is a list of Membership Management solutions that work with PayPal:

aMember - PHP-based user management program

ASPMemberEeeZ - Membership services system

Automated Member Management - Subscription membership manager and directory password protection

Bantrax Dev Studio

Bio-Business PayPal Membership Software for Windows NT/2000 - Turn key solution for password-protected access to WinNT folders

CGI Script.Net PayPal Membership Automation - PayPal membership automation

DreamAccount - Membership solution for digital media and online services

DynaSecure - PHP-based user management script for secured content

EliteWeaver Password Pal - Click and build interface for subscription membership access using PayPal subscriptions (Unix-based systems)

Flicks.com - PayPal membership solutions and IPN Consulting for Windows NT and Windows 2000

GroundBreak Membership Mgmt System - Unix-based htaccess password protection administration

iSubscribe - Subscription Membership Automation and Content Management Software

Membership Client PRO - Membership service for secure access

MembersPro - An ASP-based membership management system

MemberZip - Enables website owners to charge subscriptions for access to website content

MojoProtector - IPN-compatible member management and password protected directory system

PalPass - Password management for PayPal subscription sales

Password Robot

Perl Studio PayPal Member Subscription - PHP or Perl-based membership scripts using IPN

Pixie Professional

SiteInteractive Account Manager Pro - Website membership management solution

Smart Elf Elfgate - Automatic password setup and real-time distribution via email

Ugophp.com Easy Site Protector 2.0 - Paid content access membership system

Wayne Lambright's Subscription Kit