Before the modern theory of operads was (re)invented there was a variant introduced earlier in

- M. Lazard,
*Lois de groupes et analyseurs*, Ann. École Norm. Sup.**72**(1955), pp. 299–400.

under the name **analyser** which is often even nowdays referred by its original French version *analyseur*.

There is a generalization motivated by some questions in noncommutative algebra, the pseudoanalyser:

- Ralf Holtkamp,
*A pseudo-analyzer approach to formal group laws not of operad type*, Journal of Algebra**237**, 1, 2001, p. 382-405, doi

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