- OpenGL::Array
- OpenGL::Image
- OpenGL::Image::Common
- OpenGL::Image::Magick
- OpenGL::Tessellation
- OpenGL::XScreenSaver
- OpenGuides
- OpenGuides::CGI
- OpenGuides::Config
- OpenGuides::Feed
- OpenGuides::JSON
- OpenGuides::RDF
- OpenGuides::Search
- OpenGuides::Search::Lucy
- OpenGuides::Template
- OpenGuides::Test
- OpenGuides::Utils
- Opening/Closing
- openlog
- OpenOffice::OODoc
- OpenOffice::OODoc::Document
- OpenOffice::OODoc::File
- OpenOffice::OODoc::Image
- OpenOffice::OODoc::Intro
- OpenOffice::OODoc::Manifest
- OpenOffice::OODoc::Meta
- OpenOffice::OODoc::Styles
- OpenOffice::OODoc::Text
- OpenOffice::OODoc::XPath
- openproc
- openpty
- openreadclose
- openslide-formats
- OpenSSL_add_all_algorithms
- OPENSSL_Applink
- OPENSSL_config
- OPENSSL_ia32cap
- OPENSSL_ia32cap_loc
- OPENSSL_instrument_bus
- OPENSSL_instrument_bus2
- OPENSSL_load_builtin_modules
- OPENSSL_no_config
- open_append
- open_by_handle
- open_excl
- open_fli
- open_memory_fli
- open_memstream
- open_memstream
- open_read
- open_rw
- open_trunc
- open_wmemstream
- open_wmemstream
- open_write
- Operators
- OPNGKS
- ops
- optimization
- option
- optionally connection its standard in
- optionFileLoad
- optionFindNextValue
- optionFindValue
- optionFree
- optionGetValue
- optionLoadLine
- optionMemberList
- optionNextValue
- optionOnlyUsage
MAN (3)
Library functions, covering in particular the C standard library