I often get asked about playgroups and have found out that there are two in Montpellier.
The first is First Steps which meets on two Thursday mornings per week opposite IBM for children aged 9months to 3yrs. It's aimed at Anglophone/bilingual families and offers structured activities with parent participation. To contact them, call Protected content email Protected content
The other is Parent Infant Group Languedoc (on Facebook PIG Languedoc). They meet Wednesdays from 3.30pm to 5.30pm for hanging out with other parents and kids over a cup of coffee. Contact this group through Facebook or let me know you're interested and I'll put you in touch with someone involved.