If you use TeX or any related system (latex, texinfo, cweb, metapost, etc.), please consider becoming a TUG (TeX User Group) member. They rely on membership and donations to keep going (and there are some tangible benefits to being a member, too).<p>(Disclosure: a friend who is active there told me they are not doing so well.)<p><a href="https://tug.org/join.html" rel="nofollow">https://tug.org/join.html</a>