Shorter term (≤ 6 months) or longer term (> 6 months) research trips
Christophe Soulard describes his year spent at Portland State University, Oregon (2017–2018) (in french)
The European Research Council awards 5-year grants to researchers who propose ambitious and original exploratory research projects. INRAE has policies specifically geared towards supporting researchers who apply.
See the offers on the JOB website
Open competitions for research scientists and research directors occur every year, and candidates of all nationalities are encouraged to apply. See announcements about open competitions on the JOB site.