Newcastle, Exeter, London Irish, Cardiff and Connacht recorded bonus-point wins in the Challenge Cup.
France full-back Scott Spedding will leave Bayonne to play for Clermont next season.
Jake White's first game in charge of Montpellier ended in a win over Toulon, while Stade Francais hung on to top spot.
Stade Francais shocked defending champions Toulon 30-6 to end the year at the summit of the Top 14.
Wins for Toulon and Clermont at the weekend has kept the race for top spot alive in France's Top 14.
Round Four of the European Rugby Challenge Cup continues on Saturday, with six fixtures on the cards.
Wins for Cardiff Blues, Connacht and Newport Gwent Dragons in round three of the European Challenge Cup.
Saturday's European Rugby Challenge Cup billing sees four matches, with London Irish and Connacht both in action.
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