If you need to make presentations online or offline a presentation software might be really helpful. However, you can also make attractive presentations without any presentation software and just making it by yourself using other alternative ways.
Presentation software however can help you to make your presentations really quickly. If you are very familiar with PowerPoint you just need to add new slides and then press F5 to run your presentation.
The same happens if you are using LibreOffice or other presentation software. There many free alternatives to PowerPoint that you can also use instead of the official Microsoft PowerPoint software. And some new presentation software also allows us to open PPT files.
Even Google has its own Google Presentations software that you can open for free with your Google account. This free web based presentation software allows you to make online presentations easily.
Also Zoho is a good presentation software alternative that runs on the cloud. With Zoho Presentations on the cloud you can run and broadcast presentations online to make live meeting share possible or remote presentations.