Vimium - The Hacker's Browser.

Netumo - Ensure healthy website performance, uptime, and free from vulnerabilities. Automatic checks for SSL Certificates, domains and monitor issues with your websites all from one console and get instant notifications on any issues.

Tridactyl - Replace Firefox's default control mechanism with one modelled on the one true editor, Vim.

AppZero - AppZero is a monitoring and migration tool that allows users to keep track of different applications and servers in both simple and complex IT environments.

Surfingkeys - Rich shortcuts to click links/switch tabs/scroll pages or capture full page, use Chrome like vim for productivity.

RedGate SQL Monitor - SQL Monitor helps you and your team find issues – before they become problems