Aspose.Slides for Cloud - Use cURL commands to create, manipulate, merge, split & convert PPT PPTX presentations & slides to PDF, XPS, TIFF, ODP, OTP, HTML & other formats.
Documize - Enterprise-grade wiki and knowledge management platform
GitPitch - The Markdown Presentation Service on Git
HackMD - Fast and flexible, real-time collaborative markdown, inspired by Hackpad.
PPTX Viewer - PPTX Viewer is one of the lightweight applications that allows you to view, create, edit and share your presentation without facing any advertisement issue.
ReadTheDocs - Spend your time on writing high quality documentation, not on the tools to make your documentation work.