I'm the author/maintainer for logmerger, a side-by-side log file viewer built using the Python `textual` TUI framework. Side-by-side view merges log files into a single vertical timeline (an inline view can also be selected). `textual` implements horizontal/vertical scroll control and mouse actions, so viewing 3 or 4 log files side-by side is not difficult. Auto-detects various common timestamp formats, plus PCAP file support (to merge network packet captures with your client and/or server logs).

PyPI: https://pypi.org/project/logmerger/ Github: https://github.com/ptmcg/logmerger (screenshots in README)