There are a variety of software available for notetaking. Some of these options include:
AudioNote2
Real-time audio recording and notetaking with PDF slide integration. (Free with paid version)
Microsoft OneNote
Microsoft's cloud-based notetaking software. Stylus compatible. (Free).
Notability
Real-time audio recording and note taking for Mac and iPad. (Free with paid version).
Otter.ai
Real-time transcription and audio recording with PowerPoint integration and notetaking. (Free with paid version).