En cuanto a alternativas para presentaciones, Aqui te cito el contenido de
un sitio, mis disculpas si hay aplicaciones privativas o que no funcionen en Linux, porque no las he revisado.
Alambic
Alambic is an enterprise class PDF creation and distribution solution. Alambic makes it very easy to create and distribute PDF documents inside and outside your company.
Artstream
(commercial) Artstream is an illustration and page layout application providing a complete content authoring environment for any medium.
CriaWips
CriaWips is a full-featured presentation application that offers a platform both for small presentations and large presentations for commercial presentations.
DFBPoint
DFBPoint is a presentation program that features text, background images, images and video playback.
Ease
Ease is a modern desktop presentation application for GNOME, with Clutter-based visuals. With a simple design, Ease is painless to use. It is intended to integrate well into your current GNOME-based desktop.
glpresent
glpresent is an OpenGL presentation tool. Simple full-scren mode and the ability to navigate forward and back. It's GL so we can have some cool inter-slide transitions.
HopSlide
HopSlide is a tool for authoring and playing slides. It supports animations, annotations (slide overlays), math formulas (MathML support and TeX syntax support), SVG images, and canvas graphical effects. HopSlide can be used to compile slides into XHTML files. These files can be used by XHTML capable browsers (e.g., Firefox). Compiled slide files can be used to play the slides without HopSlide.
Imposter
Imposter is a standalone viewer for the presentations created by OpenOffice.org Impress software. User interface uses GTK2 toolkit. GNOME Human Interface Guidelines are followed but GNOME libraries are not used to keep dependencies at minimum.
KeyJnote
KeyJnote is a program that displays PDF presentation slides with style. Smooth alpha-blended slide transitions are provided for the sake of eye candy, but in addition to this, KeyJnote offers some unique tools that are very useful for presentations.
KeyJnoteGUI
KeyJnoteGUI provides a nice KDE frontend to KeyJnote. KeyJnote is a somewhat different presentation program. It uses OpenGL to present some cool visual effects during a presentation.
kpresenter
KPresenter is a presentation application. With KPresenter, you can prepare a set of slides for use in an on-screen slideshow or for printing. Your slides can include text and graphics in a variety of formats, and of course, you can embed all sorts of objects.
MagicPoint
Magic Point is an X11 based presentation tool. It is designed to make simple presentations easy while to make complicated presentations possible. Its presentation file (whose suffix is typically .mgp) is just text so that you can create presentation files quickly with your favorite editor (e.g. Emacs, vi).
mechapoint
mechapoint is a simple presentation player written in C++. Mechapoint uses an XML file format, and displays its graphics using Evas.
Multitalk
Multitalk is a presentation program designed for giving more interactive and engaging talks. Slides are laid out in a two- dimensional canvas that you navigate in any direction, in real time, using the mouse. All of your talks can be merged into the same space. You can zoom out and create hyperlinks between slides. Each slide may also contain nested expandable sections like a folding text editor. Every slide can have an arbitrary style to control layout and visual appearance.
Pointless
Pointless is a presentation tool primarily targeted at the un*x world. Presentations are made using a simple markup-language (best described as a mix between TeX and Pod, and affectionately known as "The Pointless Language"). The resulting slideshow is rendered using FreeType and OpenGL for optimal visual quality. Hardware accelerated OpenGL is highly recommended but not required in order to run pointless. The pointless tool is designed in an extensible way, allowing the user to make simple presentations with minimal effort, yet providing for more complicated presentations through the inclusion (or, if necessary, coding) of extension modules.
Portable Presenter
Portable Presenter is a package designed to give presentations. It is written in Perl/Tk only, which is available for UNIX and for Windows.
RaccoonShow
RaccoonShow is a little program to convert some slides and audio for a presentation into Macromedia Flash format. This makes it easy to put your presentations online.
tpp
tpp is text presentation program: an ncurses-based presentation tool. The presentation can be written with your favorite editor in a simple description format and then shown on any text terminal that is supported by ncurses - ranging from an old VT100 to the Linux framebuffer to an xterm.
Xebece
Xebece is a multipurpose tool for information visualization and organization. It can be used to set up intriguing presentations. Likewise, Document management is straightforward and effective if you use Xebece.
xsw
xsw is a slideshow presentation tool for those who are frustrated with Microsoft PowerPoint and its clones.
PD. Si tienen oportunidad de revisar estas aplicaciones y notan que alguna es privativa, avisen para eliminarla del listado.