From Wikipedia in quoting Phillp Schaff: ''The national Synods at Alençon, 1637; at Charenton, 1645; and at Loudun, 1659 (the last synod permitted by the French government), decided against the excommunication of Amyraut but delimited his views in order to avoid further variance with historic Reformed orthodoxy. He gave the assurance that he did not change the doctrine but only the method of instruction. His opponents allowed that the idea of a universal grace by which no one was actually saved unless included in the particular, effective decree of election, was permissible. In this way hypothetical universalism was sanctioned as a permissible view, along with the particularism that had characterized historic Reformed orthodoxy, and a schism in the French Church was avoided. The literary controversy continued for several years longer and developed a large amount of learning and ability, until it was brought to an abrupt close by the political oppressions of the Reformed Church in France.
This article uses public domain material extracted from Schaff, P. (1876)[6]
Schaff, Philip (ed.), Creeds of Christendom Vol. 1, (Harper & Brothers, 1876) p. 483ff. Public Domain. ''
It seems that the greatest contribution of the Huguenots would be that they permitted 4 point calvinism as within the Confessional bounds (though right at the border) of Reformed confessional Orthodoxy.
The wikipedia article quotes RC Sproul saying: ''Reformed pastor and author R.C. Sproul suggests there is confusion about what the doctrine of limited atonement actually teaches. While he considers it possible for a person to believe four points without believing the fifth, he claims that a person who really understands the other four points must believe in limited atonement because of what Martin Luther called a resistless logic.''Sproul R.C. The Truth of the Cross. Reformation Trust Publishing: 2007 ISBN 978-1567690873, pp.140-142''
From my personal reading I tend to disagree with Sproul. While I agree personally with particular redemption biblically , it does seem that a 4point calvinist can be considered an Orthodox Calvinist. The Hugeonuts seemed to agree as well.