While that has a lot of issues for open source projects that need to be fixed, most of the ones I can see there are projects that have hundreds or thousands of contributors maintaining them. From my reading of the question, OP is asking for projects that need more maintainers (ie because there are far too few). Are there smaller projects listed on codetriage as well?
A staggering number of FLOSS projects have a very low bus factor (1-2). My recommendation is to find some project that interests you, fits the scale of what you know, and provides a means to learn new things. Once you've identified some options try contributing to a few and stick around the one that's a good fit.
In addition, any project on the sidebar of https://www.git-pull.com would help from a maintainer.
If you like the Chinese / Japanese / Korean language, another promising project I have (which has yet to gain traction) is https://cihai.git-pull.com for CJK-related language tools. I am designing it to be a successor to cjklib (https://pypi.python.org/pypi/cjklib)
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[ 4.2 ms ] story [ 27.9 ms ] threadSeem like the official firebase library may be the only alternative
If you like Python, tmuxp (https://tmuxp.git-pull.com) and libtmux (https://libtmux.git-pull.com) could both use maintainers.
In addition, any project on the sidebar of https://www.git-pull.com would help from a maintainer.
If you like the Chinese / Japanese / Korean language, another promising project I have (which has yet to gain traction) is https://cihai.git-pull.com for CJK-related language tools. I am designing it to be a successor to cjklib (https://pypi.python.org/pypi/cjklib)