Here are a few of those videos you might have missed, starting with three from Libellud, with Dice Forge: Rebellion having debuted at FIJ 2019, with the co-operative deduction game One Key coming in the middle of 2019, and with Obscurio due out at the end of the year.
FIJ is an unusual show as it highlights the nature of French designers and publishers to demo unpublished game designs in public long before they'll be available in a published form. Designer Cédrick Chaboussit presented Dice Quest, for example, even though the game won't be released by Bombyx until FIJ 2020. As another publisher told me, they typically test and promote prototypes in public for a year to ensure that the game is both well-known and developed as thoroughly as possible.
As an example of that practice, here's an overview of Clash of Rage, a giant game from Frédéric Guérard and Le Boite de Jeu, with my first video of this game having been recorded at FIJ 2017.
Devil Pig Games dropped by our booth to show off the finished version of Heroes of Normandie: The Tactical Card Game, which had been Kickstarted in October 2016. Finally landing on shores now!