I would suggest getting the latest version of the LibreOffice suite, the repository version is several steps behind, and developing your presentation using Libre Office Impress, using Powerpoint software and then converting to Impress I've always found to be less than satisfactory. Preview your presentation using a Rasberry Pi, and check which transitions work best for you. Simple fades and wipes work well, as do sequential reveals on the same slide. Given their low cost, you might also consider locating one Pi with the projector, and uploading presentations to it from a second Pi which is used to edit and preview presentations.
I haven't got around to using it myself, but PiPresents might be worth looking at, as its intended for running presentations and stuff.
Good luck, and remember to share your experience with others
andrum99 wrote:The Raspberry Pi can be used to display a Powerpoint presentation using LibreOffice. It will not be particularly fast thought. I would expect that the Pi 2 would probably be fast enough for displaying Powerpoint presentations, although I have not used it for this myself. Other software is also available - others would better advise you on that. It depends what you want it to do which software will suite best. Note that software designed for the PC or Mac will not normally work on the Raspberry Pi, although there are often suitable alternatives.
The Raspberry Pi has both composite video and HDMI outputs, but can also be connected to a DVI or VGA display using an adapter. HDMI to VGA adapters are not expensive - they are available for a few pounds and are certainly not more expensive than the Pi. The Pi can be sited far away from the projector using special extension cables, or can be placed next to the projector - it's up to you.
The bonus is that the Raspberry Pi is a lot cheaper to buy than a PC or Mac.