3DsMax's Optimize tool in Blender I've been looking for something similar to 3Dsmax's Optimize too, Maybe an addon. Being able to connect verts by holding and dragging over the topology on the fly or holding another button to weld or target weld would be nice.
Just to be clear I don't mean to use the knife tool, or to have to select verts then connect, or switch tools in general. Looking for an option that helps with the speed of triangulating, welding, and target welding and generally optimizing a game topology.
Thanks :)
So ,You have not given enough detail to work with but you have given the name Optimize tool so i did some search and found this on Autodesk's site

The ProOptimizer feature is an optimization tool that helps you reduce the number of vertices (and so the number of faces) in an object while preserving the object's appearance.

so that can be done using a modifier in blender which is not an addon and is available by default known as a Decimate modifier that reduce geometry and tries to preserve geometry
Some example
This is a 24 thousand vertices cube

This is the same cube after decimating