LinkAid

- Easy to manage contacts by dividing them into groups of tree structure.

- You can quickly select contacts using groups (and hashtags & organizations in addition), and set up groups, register events, send emails or texts, set reminders for each contacts.

- Provides a variety of statistical reports on call logs, and allows you to manage lists in order of contact.

- You can easily see contact-specific reminders and upcoming events in the dashboard.

Master99

- Time attack challenge with 2~19 tables

- Square numbers challenge

- Ratio calculation challenge

- Quarterly world record ranking provided

- Systematic level system with various achievements

SmashingHunter

- Time attack challenge with 2~19 tables

- Square numbers challenge

LinkDrive

- You can manage various bookmarks in 2-dimensions by dividing them into folders.

- You can use various components such as memo and world clock.

- You can share hot links with other users and save them very easily.

- You can serialize multiple links by grouping them into a link set, or follow other users' link sets.