I actually researched my list, most the technologies were used internally for years and either publically released after better public alternatives had been adopted or it seems buzz reached me years after Google's first release.

Between 2012-2015 I used to consult on Apache Ivy projects (ideally moving them to Maven and purging the insanity people had written). I got asked to help solve a lot of Guava/GSon issues, often their would be some annoying bug for the team and a patch release would have the fix but some other library they used pulled it in and even patch releases increases would break the other library. So most of the time you'd find out what they needed guava for and just point to the relevent commons library.

Fun story in 2016-2017 I got called to consult on a lot of Gradle projects to fix the same kind of stupid things people did with Apache Ivy. Ivy knew the Gradle 'feautres' were a massive headache in 2012 and told you not to use Maven for those reasons. Ce La vie.