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MamaSta Community (ママスタコミュニティ) is a Japanese discussion board presented as a place for mothers nationwide to exchange views and seek advice. Its official homepage describes conversations about childcare, spouses, in-laws, and relationships with other mothers, as well as fashion, hobbies, news, and television dramas. Visitors can search by keyword or category, browse topics ranked by popularity or ordered by recent updates and posting time, and see current discussions, tags, and polls. A topic-creation entry is also available. The service is therefore broader than a childcare information site: it hosts community discussion about family concerns and everyday interests. The homepage links to member registration and sign-in, but does not specify which features require an account or state pricing.

Girls Channel (ガールズちゃんねる) is a Japanese discussion community whose homepage invites women to chat about subjects they enjoy. The live front page lists popular and newly created topic threads with comment counts, provides a way to submit a topic, and lets visitors browse by category. Visible categories include relationships, beauty, fashion, family and childcare, food, health, daily life, work, television and film, music, news, politics, sports, technology, animals, and general questions. The service is centered on user-created topics and public comment discussions rather than one narrow subject area. Its category list also includes an adults section, so the whole site should not be presented as suitable for every audience. Pricing and account rules were not stated on the reviewed homepage.

Futaba Channel (ふたば☆ちゃんねる) is a Japanese image-board community built around a directory of topic-specific boards. Its official menu links areas for animals, food, transport, hobbies, games, news, politics, and many other interests. On the cat board reviewed, visitors can read public image-and-text threads, reply, or start a thread with an attachment; the page lists GIF, JPG, and PNG uploads up to 3,000 KB. That board also offers a catalog and several ordering views, states how many posts it retains, and displays poster IP addresses. The main menu visibly includes adult and graphic-content boards, so the service should not be described as uniformly suitable for every audience. Pricing and account rules were not stated on the pages reviewed.

2channel.sc is a Japanese multi-board bulletin-board forum with a large directory of topic-specific boards and threaded discussions. Its official board menu spans news, society, business and careers, science and humanities, entertainment, hobbies, and everyday interests. Visitors can browse the board index and threads, and search by thread title, post body, or author. The observed introduction says body-text search and search settings require login, while the main board directory is publicly accessible. The homepage currently labels the service as being in beta testing, so its own stated development status is worth noting when visiting.

5channel (5ちゃんねる) is a Japanese internet forum organized into topic-specific discussion boards and threaded posts. Its front page brings together threads from multiple boards, including news, and displays titles and reply counts for visitors to browse. The supplied 5ch.net address redirected in Chrome to the current 5ch.io front page. According to the official FAQ, an account is optional; registered users can follow boards and users to personalize their front page. Threads can be sorted by activity, newest, length, or power, and visitors can hide posts or filter topics for their own view.

Yahoo! Chiebukuro is a Japanese community Q&A service where people post questions and advice requests for other users to answer. Its categories cover everyday life, health, hobbies, technology, careers, business, education, and more. Visitors can browse recent questions, posts still seeking answers, and resolved discussions; listings show answer counts and sometimes identify a best answer with Chie Coin rewards. Public questions and answers are viewable without signing in, while posting and account features such as My Chiebukuro require a Yahoo! Japan account. The site also links to expert answers, a personal-advice feature, an official blog, and help resources.

LinkedIn Japan is the Japanese-language entry point to LinkedIn's professional network. Members connect with colleagues, classmates, and professionals, discover people, companies, and job listings, and exchange knowledge and ideas in professional communities. The homepage features LinkedIn News and industry insights, online courses through LinkedIn Learning, and ways to explore career and business opportunities. It also links to job, people, and company directories, mobile apps, and employer solutions for talent, marketing, and sales. The observed Japanese homepage asks visitors to sign in or register to use member features.

YOUTRUST is a Japanese professional social network for career development and discovering work. Members can connect with former colleagues and people in similar industries or age groups, join communities, exchange information, and message one another. The service lists full-time and side-work opportunities and offers casual career conversations with experienced professionals. It also promotes online events on practical subjects such as AI, sales, marketing, and engineering, alongside articles and videos featuring business leaders and entrepreneurs. The official homepage advertises free member registration. For organizations, separate business offerings include YOUTRUST Talent recruiting support, plus advertising, sales, and research services. Using member networking and career features requires signing up.

Wantedly is a Japanese career and business social network that connects people with companies through shared interest in a company's mission and work. Job seekers can read recruiting posts and company stories, then request an informal visit or conversation to learn about the role and workplace. Members build profiles to record experience, goals, and professional activity. The related Wantedly People service scans business cards and helps users share contact-profile information. The employer section lists job postings, direct scouting, AI-agent functionality, and a blog for recruiting communications. The homepage presents separate mobile apps for Wantedly Visit, Wantedly Intern, and Wantedly People; users sign up to begin using the core matching and profile features.

TECH PLAY is a Japanese technology media and event platform for engineers and people learning about technology. Visitors can browse seminars, study groups, and other learning events, including online and in-person sessions, and explore dates and topics through its event calendar and technology tags. The site also publishes magazine interviews and event reports, technical blog articles, original videos, archived event videos, and information about related books. Companies, individual organizers, and organizations can create and publish group and event pages, while visitors can discover groups and activities relevant to their interests. TECH PLAY's official introduction says that creating and publishing group and event pages is free.

Doorkeeper is an event and community management service for seminars, meetups, and other gatherings. Organizers create community and event pages, set ticket types and capacity, customize registration forms, and manage attendees or waitlists. The platform supports prepaid ticket sales, QR-code check-in, participant messages, and events held online or in person. Mailing lists and recurring membership plans help communities stay connected between events. Attendees can register with only an email address and do not need a Doorkeeper account. Organizers can run their first event for free; a paid plan is required for later events, and prepaid tickets carry transaction fees.

connpass is an IT meetup and event platform used by engineering communities to plan gatherings and recruit attendees. Organizers can publish event pages, define several attendee types and application periods, add questionnaires and co-organizers, and choose first-come or lottery-based registration. They can manage applicants, send reminders, and collect presentation materials. Attendees can search events, apply or join a waitlist, bookmark events, follow groups for updates, and review shared slides after a meetup. The service works on PC and mobile. Official guidance says registration and use of connpass are free, although an organizer may charge an event fee; connpass says it adds no fee to prepaid payments beyond PayPal's own charge.

teratail is a Japanese technical Q&A community for people interested in programming and IT. Members exchange knowledge through two kinds of posts: Q&A for a specific programming problem and discussion for broader topics about programming or IT engineering. Questions can use templates and Markdown; replies and comments help clarify a problem, and the asker can select a best answer to mark it resolved. A clip feature lets users save questions to revisit, while feeds help them browse recent, unanswered, or resolved topics. The service supports PC and mobile, and its official help says registration and all services, including asking and answering, are free.

note is a Japanese publishing and community platform where creators share writing and other creative work with readers. Posts can combine text and images, include embedded audio, and link to videos hosted on external services. Creators can group posts into magazines and offer a mix of free material, individually paid articles, paid magazine collections, subscription magazines, and monthly memberships. Memberships can provide members-only articles or magazines and may include a private message board for interaction. Readers can discover work across many subjects, while the price and access conditions depend on each post or creator's plan.

Google Calendar is an online calendar for planning meetings, events, and dated tasks. Users can invite guests, keep separate work and personal calendars, and share a calendar with selected people using different permission levels. Calendar connects with Gmail, Google Tasks, and Google Meet: eligible reservation details from Gmail can appear as events, dated tasks can be viewed in the calendar, and Meet video calls can be added to events. The service is available on the web and mobile apps and syncs across devices. A Google Account is required. Personal accounts can create one appointment booking page; multiple booking pages, payments, and other advanced scheduling options depend on eligible paid plans.

Kakaku.com is a Japanese site for comparing products and consumer services. It brings together prices from participating shops along with specifications, price histories, rankings, user reviews, discussion boards, and buying guides for areas such as computers, appliances, cameras, phones, vehicles, communications, insurance, and utilities. Kakaku.com does not sell the products itself; shoppers continue to a listed retailer to purchase. Prices, shipping, and terms may change, so buyers should confirm current details with the shop. Browsing is open, while posting reviews or comments requires a free Kakaku.com ID.

Cookpad is a recipe-sharing community for people who cook at home. Visitors can search by ingredient, dish, or cooking utensil, explore regional communities in different languages, and read recipes shared by other cooks. With an account, members can save recipes in searchable collections, organize them into folders, publish their own recipes privately or with the community, and share cooksnaps—photos and comments after making a recipe. A Premium subscription adds recipe-discovery features, including ways to find popular recipes; available features can vary by region.

QRCode Monkey is a free browser-based tool for making static QR Codes that contain URLs, text, email or phone details, contact cards, Wi-Fi settings, locations, events, and other supported content. Users can customize colors, shapes, and logos, preview the design, and download formats such as PNG or SVG, with PDF and EPS available for supported designs. Codes do not expire and have no scan limit, but their encoded content cannot be edited after creation. The site says it does not save or reuse entered data, while generated QR image files are cached on its server for 24 hours.

Have I Been Pwned (HIBP) lets people check whether an email address or username appears in known data breaches and publicly exposed paste records. Results identify breach sources and exposed data categories included in HIBP's collection, but a missing result does not prove an account was never compromised. The separate Pwned Passwords service checks passwords against previously exposed passwords using k-anonymity: the password is hashed locally and only a short hash prefix is sent. Sensitive-breach results and searches across a domain require verification.