Suggestions for Halloweenmath

The following packages have something in common with the package Halloweenmath. The packages are ordered in decreasing similarity.

Package abraces: Asymmetric over-/underbraces in maths
Package ducksay: Draw ASCII art of animals saying a specified message
Package stackrel: Enhancement to the \stackrel command
Package gensymb: Generic symbols for both text and math mode
Package trfsigns: Typeset transform signs
Package turnstile: Typeset the (logic) turnstile notation
Package realtranspose: The real way to transpose a Matrix
Package sillypage: John Cleese’s Silly Walk as page numbering style
Package bearwear: Shirts to dress TikZbears
Package autobreak: Simple line breaking of long formulae
Package eqnarray: More generalised equation arrays with numbering
Package thmtools: Extensions to theorem environments
Package esvect: Vector arrows
Package colonequals: Colon equals symbols
Package esint: Extended set of integrals for Computer Modern
Package newproof: Make commands to define proofs
Package resizegather: Automatically resize overly large equations
Package blkarray: Extended array and tabular
Package cases: Numbered cases environment
Package cancel: Place lines through maths formulae
Package dotseqn: Flush left equations with dotted leaders to the numbers
Package empheq: EMPHasizing EQuations
Package ebproof: Formal proofs in the style of sequent calculus
Package fitch: LaTeX macros for Fitch-style natural deduction
Package nccmath: Extended mathematics capabilities
Package oubraces: Braces over and under a formula
Package prftree: Macros for building proof trees
Package polynom: Macros for manipulating polynomials
Package subeqnarray: Equation array with sub numbering
Package subeqn: Package for subequation numbering
Package thmbox: Decorate theorem statements