Image Export converts PowerPoint slides to high-quality images.
PPT2HTML exports HTML even from PowerPoint 2010 and 2013, gives you full control of PowerPoint HTML output, helps meet Section 508 accessibility requirements
Merge Excel data into PowerPoint presentations to create certificates, awards presentations, personalized presentations and more
Resize your presentations quickly and without distortion
Language Selector switches the text in your presentation from one language to another
FixLinks prevents broken links when you distribute PowerPoint presentations
Shape Styles brings styles to PowerPoint. Apply complex formatting with a single click.
Prep4PDF preserves interactivity in PowerPoint presentations when you convert to PDF
An add-in suddenly stops working
An add-in that worked before suddenly disappears or ceases to work.
Office 2003 / Service Pack 3 (SP3) disables some add-ins
If you use Office 2003 / PowerPoint 2003 and have recently applied Service Pack 3 (SP3) or if you have automatic updates enabled in Windows and SP3 may have been applied for you, this Microsoft knowledgebase article explains what happened and gives several workarounds: