just some wordpress plugins that I like and use

Anti-spam, used for contact forms.

Allows you to set update logic or disable individually, per plugin or theme.

For conveniently updating assets in the Media Library.

A great companion to Gravity Forms; allows you to set up complex routing and conditional workflows with your forms.

The best forms package around; my favorite plugin due to its extensibility.

This and Wordfence are both good, but I like the interface for iThemes Security better.

Free analytics alternative to Google.

Very useful for debugging and testing new code.

Automatic code formatting for displaying to the front-end.

Allows the uploading of SVG files to the media library.