Autoresponders

GetResponse – simple autoresponder that integrates with most popular marketing tools
ConvertKit – my top recommended autoresponder for affiliate marketers
Imnica Mail – free autoresponder solution up to 1000 subscribers
Market Hero – the only marketing automation suite that tells you your ROI

Lead Capture

LeadPages – great tool to get up and running to build your list quickly
OptimizePress – great tool for building squeeze pages, sales pages and membership sites
SumoMe – a free lead capture solution for your website or blog
UpViral – amazing tool for helping you grow your list virally
Optin Architect – create high converting lead capture forms
Clickfunnels – easily create sales funnels and membership sites that convert
OptinMonster – affordable and flexible WordPress lead generation plugin
LeadPageDesign – custom LeadPages template design
SeedProd – coming soon WordPress plugin

List Hygiene

BriteVerify – email validation and verification
ListWise – email address validation service

Other

AW Pro Tools – turbo charge your AWeber mailing list
My Funnel Empire – done for you list building system
The Secret Webinar – how to generate HUGE income with a very simple system
OuttaTimr – email countdown timer
WP Sharely – WordPress plugin designed to grow your list virally