Radio Kiku! News ラジオ 聴く！ニュース (Android, iOS)
This is an aggregator for podcasts from a variety of sources including NHK Radio News, TBS Radio Dig, Nikkei Biz Trend News, and more. You can download podcasts for offline listening within the app. Free.
Japan Radio (Android)
Japan Radio aggregates radio programs from a variety of stations, including NHK. Free.
Radio Chishiki Up ラジオ 知識アップ (iOS)
This is an aggregator for educational and news podcasts. You can download podcasts for offline listening within the app. Free.
Matome Blog Reader まとめブログリーダー (Android, iOS)
This app aggregates posts from various livedoor blogs, allowing you to view most-shared and popular topics. Free.
Hatena Blog はてなブログ (iOS)
This is the official app for Hatena's blog site, including popular and topic-organized posts. You can also update your own blog. Requires free registration via Hatena's website. Free.
There are a wide variety of news apps for iOS and Android. This is a selection.
@nifty News (Android, iOS)
This aggregates news by topic from the site @nifty. Free.
NAVER Matome Reader (Android)
This app aggregates news and pop culture resources from various sources and organizes them by topic. Free.
Hatena Bookmark はてなブックマーク (Android, iOS)
This is a service that ranks bookmarks to articles on news and pop culture topics by the number of times they are shared by Hatena users. Users can fill out a free registration at Hatena's website to participate and view bookmarks. Free.
G!News Free G！ニュースFree (iOS)
This is a Google News viewer that aggregates news stories from many sources by topic. Free.
G−News Region (Android)
G-News allows users to choose their region of Google News and displays those aggregated stories. Users can select Japan as their region. Free.
Japan News Online - 日本のニュース 新聞 (iOS)
This app aggregates news from a wide variety of newspapers and news sites, and organizes by publication rather than topic. Free.
Japan Newspapers (Android)
This is an aggregator for a variety of Japanese newspapers, and organizes by publication rather than topic. Free.
Shinbun * Zenshi Muryō 新聞＊全紙無料 (Android)
This app is an aggregator for a variety of major Japanese news sources, and includes keyword search and bookmarking, as well as an emphasis on sharing. Free.
Muryō de Yomeru Shinbun 無料で読める新聞 (Android)
This is an aggregator for a variety of major Japanese newspapers, organizing by publication rather than topic. Free.
This app aggregates from a variety of popular news sources as well as 2-ch. It organizes by topic rather than news source. Free.
Japanese Local News Flash (Android)
This app aggregates news stories from a variety of local newspapers in Japan, organized by top news as well as region. Free.
Asahi Shinbun Digital 朝日新聞デジタル (Android, iOS)
This app requires a paid digital subscription to the Asahi Shinbun to view content, although you can view 3 articles per day for free with registration. Free, with paid subscription.
Mainichi (Android, iOS)
This is the official app for the Mainichi Shinbun. It contains news by topic in Japanese. Free.
Nikkei Business 日経ビジネス (iOS)
This app requires a paid subscription to the digital version of Nikkei Business. Free app, with paid subscription.
Sankei Shinbun 産経新聞 (Android, iOS)
This is the official app of the Sankei Shinbun. It is somewhat difficult to use because it provides images of newspaper pages rather than plain text articles sized for a phone or tablet. There are also two RSS readers for Android that provide news from Sankei Shinbun in plain text sized for a mobile device. All are free and do not require a subscription.