Find free or open source alternatives to the following paid software

Mailmodo

Mailmodo is an email marketing platform for creating and sending interactive AMP emails.

Redisson

Redisson is a Java client for Redis that offers distributed objects and services.

Medis

Medis is a Redis GUI client for macOS that provides a simple interface for managing Redis databases.

Updown

Updown monitors website uptime and sends alerts when your site goes down.

Site24x7

Site24x7 is a cloud-based IT monitoring service for websites, servers, and applications.

Stackify

Stackify is an application performance monitoring and error tracking tool for developers.

imyPass

imyPass is a video converter for converting videos between various formats and devices.

Enpass

Enpass is a password manager that securely stores and autofills credentials.

AWS WAF

AWS WAF is a web application firewall that protects apps from common web exploits.

Proto.io

Proto.io is a prototyping tool for designing and testing interactive app and web prototypes.

Sketch

Sketch is a Mac design tool for crafting interfaces, icons, and prototypes.

Krpano

Krpano is a tool for creating and viewing interactive 360° virtual tours.

Paperform

Paperform is an online tool for creating beautiful forms, surveys, and landing pages.

Typeform

Typeform is an online platform for building interactive forms, surveys, and quizzes.

Zoom

Zoom is a video conferencing platform for online meetings, webinars, and collaboration.

Oray

Oray provides remote desktop, dynamic DNS, and network management services.

Comodo

Comodo is a cybersecurity suite providing antivirus, firewall, and internet protection.

Sectigo

Sectigo is a certificate authority providing SSL/TLS certificates and digital security solutions.

GeoTrust

GeoTrust is a digital certificate provider for securing websites with SSL/TLS.

Thawte

Thawte is a certificate authority for SSL/TLS and digital security.