Suggestions for lambdax
The following packages have something in common with the package lambdax. The packages are ordered in decreasing similarity.
- cdcmd: Expandable conditional commands for LaTeX
 - inlinedef: Inline expansions within definitions
 - ltxnew: A simple means of creating commands
 - optparams: Macros with multiple optional parameters
 - xoptarg: Expandable macros that take an optional argument
 - xnewcommand: Define \global and \protected commands with \newcommand
 - ccool: A key-value document command parser
 - letltxmacro: Let assignment for LaTeX macros
 - styledcmd: Handling multiple versions of user-defined macros
 - xtemplate: A high-level interface for declaring document commands
 - xparse: A generic document command parser
 - mathcommand: \newcommand-like commands for defining math macros
 - advice: Extend commands and environments
 - xfp: Interface to the LaTeX3 floating point unit
 - defstring: Define macros as verbatim macros
 - getoptk: Define macros with sophisticated options
 - serbian-def-cyr: Serbian cyrillic localization
 - dvisvgm-def: Colour and Graphics support for dvisvgm
 - pdftex-def: Colour and Graphics support for pdfTeX
 - dvipdfmx-def: Configuration file for dvipdfmx graphics
 - graphics-def: Colour and graphics option files
 - default: Provide default parameters for TeX macros
 - eoldef: Define commands which absorb the whole source line as arguments
 - namedef: TeX definitions with named parameters
 - forloop: Iteration in LaTeX
 - enverb: Read an environment verbatim
 - ifnextok: Utility macro: peek ahead without ignoring spaces
 - arraysort: Sort arrays (or portions of them)
 - conv-xkv: Create new key-value syntax
 - fetchcls: Fetch the current class name
 - multidef: Quickly define several similar macros