Mac OS X

• Notational Velocity

  Notes app for Mac OS X. An attempt to loosen the mental blockages to recording information and to scrape away the tartar of convention that handicaps its retrieval. Maintained by Zachary Schneirov.

• DashNote

  Easily access your Simplenote account from your Mac OS X dashboard. By Resen, Corp.

• Nottingham

  A Mac OS X notes app in the spirit of Notational Velocity, by Tyler Hall. Supports tags, Markdown, WikiLinks and more.

• JustNotes

  A native, Mac OS X notes app, by Matthias Hochgatterer. Designed from the ground up to synchronize with Simplenote. Can import notes from Evernote and text files.

• Scrivener

  A powerful content-generation tool for writers that allows you to concentrate on composing and structuring long and difficult documents. By Literature & Latte.

• Click.to

  Send text from your Mac's clipboard to Simplenote with a single click. By Axonic.

• Metanota

  A Mac OS X client and editor for creating and managing notes. Includes search, auto-formatting and full tag support.

• Tinderbox

  A personal content assistant for Mac OS X that helps you visualize, analyze, and share your notes.

• Twig

  A swift and agile tool for gathering and cultivating your ideas.

Windows

• ResophNotes

  A Simplenote client for Windows, by C.Y. Yen.

• GumNotes

  Take notes in Windows, set reminders, and share them with other people. You can also attach notes to any document, website, or email. By Axonic.

• Click.to

  Send text from your Windows clipboard to Simplenote with a single click. By Axonic.

Services

• Simple Import

  A beta service for importing existing notes into Simplenote. Supports plain text, CSV, JSON, XML, YAML, and Evernote archive formats. Please email support@simplenoteapp.com with any problems you encounter.

• Simple Export

  A backup and export solution. Originally by Alex Payne, now maintained by Simperium. Supports plain text, CSV, JSON, XML, YAML, and Evernote archive formats.

• NoteTote

  Lets you remotely tell your Mac at home to download files by pasting links into your Simplenote account. By Scott Jackson. (Formerly MobileDL.)

• Notestack.me

  An open source web client with keyboard shortcuts, offline mode, and support for all Simplenote features. By Britt O'Halloran.

Mobile

• SymNote

  A Simplenote app for Symbian devices. Created by Talv Bansal.

• pondNotes

  A Simplenote app for webOS 3.0.0 and later. From the developer of 'Noted!'.

• BerryNote

  BerryNote provides a feature-rich Simplenote experience on the PlayBook tablet. Created by Vivace.

• Listary

  A lists app for iPhone and iPod touch, by Portmanteau. Make lists of all kinds of stuff and keep everything in sync using your Simplenote account.

• Notational Acceleration

  A basic note taking app for Android devices in the tradition of Notational Velocity, by Kludgenics.

• Noted!

  A notes app for Palm webOS, with no frills or fancy features that get in your way. Syncs with Simplenote so you can get access to your notes from practically anywhere.

• Flick Note

  A top-rated Android client that syncs notes – with pinned status, tags, and trash – with Simplenote. Paid and ad-supported versions available.

• Simple Paper

  An efficient and handy note-taking app for Windows Phone 7 that synchronizes with Simplenote. Created by Xu Li.

• JadeNote

  A full-featured text note application for Android, based on the Simplenote API.

• mNote

  A fast notepad for Android allowing for offline local note editing, management, and searching.

• AndroNoter

  A basic Simplenote client for Android. Free, no ads.

• SolidNote

  A note taking application for Android phones that syncs with Simplenote.

• Hidden

  You can keep your private notes hidden with Hidden app. It's a note taking application for iPhone that syncs with Simplenote.

• NoteTask

  Transform your notes into a simple task management system. NoteTask presents your text as tasks, completed tasks, and sections.

Extensions, Scripts, and Plugins

• gSyncit

  gSyncit provides syncing between Simplenote and Microsoft Outlook. By Fieldston Software.

• QuickFox Notes for Firefox

  QuickFox Notes is a multi-tab note taking add-on for Firefox that uses the integrated bookmarks system to store notes. Syncs with Simplenote. By InBasic.

• Syncpad for Simplenote, a Google Chrome Extension

  A browser extension for Google Chrome that allows viewing and editing of Simplenote content, both online and off. Supports tags, pinned notes, searching, and more. By Stephan Hattinger.

• Simplenote.vim

  A plugin that allows you to use Simplenote from within the vim editor, by Daniel Schauenberg.

• Emacs Package

  An Emacs package that allows you to use Simplenote from within Emacs, by Konstantinos Efstathiou.

• SimplenoteSync

  A Perl script for syncing with local text files, by Fletcher Penney. Read the instructions carefully. Compatible with any software that can access text files.

• Simply Noted

  A plugin for the Habari blogging platform, by Morgante Pell.