With Audio Capabilities
AudioNote - Synchronizes notes and audio, automatically indexes your meetings, lectures, or study sessions; mimics the functionality of the LiveScribe SmartPens; free version allows 10 minutes per note/2 hrs max; paid version allows unlimited recording and emailing notes. $4.99 Apple application.
Livescribe SmartPen - Smartpens record everything you write and hear so you'll never miss a word. Replay your meetings or lectures simply by tapping on your notes. SmartPen is shipped to you upon your order and purchase. Retail pricing starts at $119.99 but they can be found for less and is compatible with both PCs and Macs.
Note Everything - Create text, voice and paint-notes; notes can be organized in folders. Create shortcuts on home, send notes, use live folders. Adds photo notes, checklists, durable checklists, reminder, encryption (password protection), backup to sd-card. Free lite version or $4.99 full version Andriod application.
Notability - Integrates handwriting, PDF annotation, typing, recording, and organizing; features synced audio (similar to SmartPen), multiple fonts, colors, styles, and sizes; photos, figures, and webpages. Text will automatically wrap around these objects. Can upload a PDF of note to Dropbox. $2.99 Apple application.
SoundNote - Tracks what you type and draw while recording audio, so you'll never worry about missing an important detail. During playback, tap a word: it will jump right to the proper time in the audio. The notes can be exported through email into another note taking system like Evernote. $4.99 Apple application.
Without Audio Capabilities
ColorNote - Quick and simple notepad editing for notes, memo, email, message, shopping list and to-do list; calander fucntion, password protect, organize by color. Free Android application.
EverNote - Stay organized, save your ideas and improve productivity, take notes, capture photos, create to-do lists, record voice reminders. Free downloadable program compatible with both PCs and Macs. Also free as an Android application and as an Apple application.
GoodReader - Handles huge PDF and TXT files, manuals, large books, magazines, rendering 100 mb +; mark-up PDFs, using typewriter text boxes, sticky notes, lines, arrows, and freehand drawings on top of a PDF file. $4.99 Apple application.
iAnnotate - Intuitive interface and comprehensive, customizable set of features let you annotate, manage, and share PDF documents; fully searchable Library-organize, find, and read your documents. $9.99 Apple application.
My Binder: Tabbed Notes - Replicates the "old school" tabbed binder or notebook experience for technological formats with highlighting and sorting features. Create an unlimited amount of separate "pages" within five customizable color-coded tabs to help organize notes. Free Android application and free Amazon Kindle Fire application.
Notetaker HD - Packing a wide array of note-taking options; multiple line thicknesses, colors, fonts, font sizes, finger-drawing input; plus the ability to import and mark up PDFs and insert and crop photos. $4.99 Apple application.
Sticky Notes - Simple and "old school" note taking on the go. Dictate or type notes; drag and drop to organize. Free Apple application.