Kushiro, known for various Blender add-ons such as Quick Fillet, Safe Inset, Delta Quad, and others, is back with another handy one. As the name suggests, Trim Mesh helps you trim meshes effortlessly.
With this free tool, you can select vertices, edges, or faces to trim precisely along the normals. You can also change the direction of the tilt for more control. Trim Mesh allows you to trim convex parts of the mesh cleanly without affecting the surrounding geometry. In addition to trimming, you can use it as a loop cut-style slicing tool: