COLMAP is a general-purpose Structure-from-Motion (SfM) and Multi-View Stereo (MVS) pipeline with a graphical and command-line interface
Scaniverse is a free, Niantic-owned iOS and Android app that turns smartphone cameras into powerful 3D scanners, using LiDAR and photogrammetry to create high-fidelity 3D models and Gaussian splats.
SuperSplat is a free, open-source, browser-based editor for 3D Gaussian Splatting, powered by the PlayCanvas Engine.