Slic3r, launched in 2011 by Alessandro Ranellucci, is a powerful open-source 3D slicer that supports the RepRap 3D printer movement. Completely nonprofit, Slic3r is one of the top free slicer options available, offering an impressive range of features for advanced users.
With robust infill options and multiple preview modes, Slic3r ensures users can fine-tune their models before printing. It supports multi-extruder 3D printers, allows for simultaneous printing on multiple machines, and works with STL, AMF, and OBJ files, exporting GCODE for printing. Additionally, Slic3r integrates with OctoPrint for remote monitoring and can handle both FDM and SLA 3D printing, making it versatile for any project.