Adjust Segments is a Blender add-on for changing the segment count of polylines and quad surfaces during modeling. You select the line or quad surface you want to work on, right-click, and choose "adjust segments" to resample it.
The operator exposes a few parameters. Segments sets the segment count of the resampled line or surface, while Uniform controls whether the resulting vertices are spaced evenly. A Use Increment option changes the Segments value from a direct count into an increment applied to the existing segment count, so the value is added to the current count rather than setting an absolute number.
As of version 0.3, the two earlier operators are combined into one that detects the context automatically, keeping the right-click menu tidy. The add-on runs across a broad range of Blender releases, from 2.83 through the 3.x series up to 4.0, and is distributed under the GPL license. A demo video is available.