Wondershare PDFelement - All-in-one PDF editor
SCARM - Simple Computer Aided Railway Modeller
Google Docs - Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.
TrainCad - Freeware Microsoft Windows program for designing model railroad layouts using standard tracks.
Foxit PhantomPDF - Edit PDF files with our feature-rich PDF Editor. Download Foxit PDF Editor to convert, sign, scan / OCR & more. A speedy PDF Editor alternative to Adobe Acrobat.
AnyRail - AnyRail makes model railroad design so easy, it's fun!