Are there any ways to contribute to FOSS developers other than paying? I would really like to help/contribute but unfortunately have no regular income so no way to do so monetarily.
contribute with your time. depending on the project, you can write the code, design the assets, help with translation, or even triage issues on the bug tracker.
@SeekPie Documentation or translation assistance is almost always a good way to help.
For people without IT background, I can recommend Mozilla common voice. They plan to release an advanced AI model for text-to-speech or speech-to-text conversion, e.g. for an offline, open source alternative to Amazon Echo, Siri etc.
To train the model they need at least 10000 hours of speech samples per language. So you can donate your voice by reading aloud small snippets, checking already recorded samples or making up new sentences.