Splitt is described as 'video splicing application that lets you cut your movies into an arbitrary number of segments. Precise Navigation Mode gives you frame-accurate control over the length of each segment' and is an app in the Video & Movies category. There are 2 alternatives to Splitt for Mac and Windows. The best alternative is MP4Tools, which is both free and Open Source.
MP4Tools is a collection of cross-platform free tools to manipulate MP4 files. It contains following applications: MP4Joiner is a free application that allows join multiple MP4 files into one without reencoding and without quality loss.
No matter where you get videos from digital camcorders, online video sharing sites or smartphones & tablets, you could use this best MP4 converting software to convert videos to MP4 easily (incl. MKV/AVI/MOV/WMV/MTS/MXF to MP4, H.265 to H.264, etc.).