Suggestions for csplain
The following packages have something in common with the package csplain. The packages are ordered in decreasing similarity.
- cslatex: LaTeX support for Czech/Slovak typesetting
 - csfonts: Czech/Slovak-tuned Computer Modern fonts
 - cspsfonts: Czech/Slovakian PostScript font support
 - csindex: Czech/Slovak version of MakeIndex
 - csfonts-t1: Czech/Slovak tuned CM fonts in Type 1 format
 - encxvlna: Insert nonbreakable spaces, using encTeX
 - base: Definitive source of Plain TeX on CTAN
 - latexrelease: LaTeX release emulation
 - plain: The Plain TeX format
 - luavlna: Prevent line breaks after single letter words, units, or academic titles
 - context: The ConTeXt macro package
 - latex-base: Base sources of LaTeX
 - ptex-base: Plain TeX format for pTeX and e-pTeX
 - uptex-base: Plain TeX formats and documents for upTeX
 - latex-base-dev: Development pre-release of the LaTeX kernel
 - tapir: A simple geometrical font
 - cstex: Support for Czech/Slovak languages
 - babel-czech: Babel support for Czech
 - babel-slovak: Babel support for typesetting Slovak
 - cstypo: Czech typography rules enforced through LuaTeX hooks
 - xevlna: Insert non-breakable spaces using XeTeX
 - lamstex: A merge of the best in AMS-TeX and LaTeX
 - blue: A document preparation system
 - inrstex: Extended Plain TeX for use with MLTeX
 - phyzzx: A TeX format for physicists
 - text1: TeX format from Washington State University
 - physe: The PHYSE format
 - ytex: Macro package developed at MIT
 - datetime2-slovak: Slovak language module for the datetime2 package
 - makeidx: Standard LaTeX package for creating indexes
 - fontenc: Standard package for selecting font encodings