Info:

Hard Ops / Boxcutter Ultimate Bundle - BoxCutter 719.3.3 - HOps 00987_Francium_22_1

hardOps
HardOps is a toolkit that encompasses more than just modelling. There are tools pertaining to rendering, mirroring and even sculpting tools. This is the core of my workflow in Blender and is recommended for anyone doing Hard Surface. We offer a variety of tools and modes intended to unobtrusively make the most of your Blender experience.

Boxcutter
Boxcutter is only a cutter. It just cuts. But that said, our focus is to make the best cutter Blender has ever seen. The purpose of boxcutter is to cut via drawing. Boxcutter is a re-approach of the boolean workflow with concepting and speed / ease of use in mind. We aim to make boxcutter the simplest system for new users making Blender a more enjoyable, tolerable and rewarding experience. From the way we draw to the way we shade. We are obsessed with every aspect of the concept creation pipeline.

Photographer 4.4.4

This add-on for Blender 2.8x and 2.9x adds new Physical Camera, Physical Light settings and a LightMixer interface for EEVEE, Cycles and LuxCore 2.5.

Photographer 4 exclusive features:
LightMixer, a user-friendly interface to manage the lights in your scene.
World Mixer, a user-friendly interface to manage your HDRIs and World materials per-camera.
Emissive Mixer, a user-friendly interface to manage the emissive materials in your scene.
Optical Vignetting and Bokeh textures support for cameras.
A revamped UI, for a more streamlined workflow.
Lots of small quality-of-life improvements and stability fixes.

Volume Preserving Smoothing 2.52

Volume Preserving Smoothing takes also into account sharp edges - they will be treated as rails for verts to slide on. This can help to maintain main shapes of smoothed object.

Features:
smooth mesh while maintaining main object shape (operator and brush)
border mesh vertices will slide along border edges, this prevents shrinking of mesh outline
smooth brush support pulling/sliding of geometry along surface of mesh
X axis symmetry is supported
works with shape-keys
you have ability to define sliding rail edges (edges marked as sharp) - they constrain sliding of geometry
three edge tension methods (Uniform, Proportional to edge length, Inverse to edge length)
optimized with NUMPY
To make edge into rail edge - just mark edge loop as sharp. Now verts belonging to this edge, will move only along edge.

Update 2.5.2 (12.08.2021)
nicer brush outline for smooth tool
fixed smoothing behavior when brush moved outside of mesh

Rotate Face v1.3

Addon for Blender 2.8
Rotate selection, using helper gizmo, without breaking adjacent faces normal directions.
It will help you to block in hard-surface planes more easily.

How to use:
in mesh edit mode open menu: 'Face' => 'Rotate Face' (at the very bottom)
or open same menu using Ctrl + F hotkey when having some faces selected.
or hit spacebar -> search for 'Rotate Face'
There is also 'Bisect mode' - where you cut the mesh with gizmo, rather than rotate face.

Update 1.3 (23.08.2021)
fix crash in latest blender 2.93.3