There are several free and open source digital audio workstation (DAW) software options that you could consider. Some popular ones include:

Audacity - This is a cross-platform software that allows recording, editing, mixing, and exporting audio files. It supports multiple tracks and features real-time effects processing. It works well for podcasts, sound design, and basic music production tasks.
Ardour - Another open-source digital audio workstation that offers advanced multitrack recording and MIDI functionality. It has a more steep learning curve than some of the others but provides many advanced features like support for VST plugins, destructive edits, group tracks, and flexible bus routing. Linux and macOS versions are actively maintained while Windows builds require manually compiling from GitHub.
LMMS - An easy to use but powerful sequencer software focused on song creation rather than audio post-processing. Though it falls under "music making" instead of general purpose multi-track recorders, its open format ensures compatibility with virtual instruments in .ZYX format. Supported platforms are Linux, Windows, and macOS.
Hydrogen - Focuses solely on beat creation & drum pattern generation and exports individual samples and MIDI files. While simple, it serves as a great companion app alongside the above recommendations. Also runs on Linux, Windows, and macOS via Wine/CrossOver compatibility layer.
Tracktion Audio - Lastly, here’s another paid proprietary application that goes completely open source during version 6’s development called Tracktion Waveform. They started a Patreon fundraiser that unlocked 1 major new feature per month. Each user who donates $2+ per year gets these exclusive new tools which benefits everyone who installs future updates. By supporting them directly or even just spreading awareness, developers hope to sustain Waveform without financial obstacles getting in their way.
These should all provide you a good starting point depending upon your needs and experience level. Let me know if you need further assistance choosing which
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