Showing 81–100 of 1,000 ranked alternatives.
Dauntless Software
Study questions and track progress
Prepare for FCC Ham exams with real, updated questions for General, Technician, and Extra tests. Practice with quizzes, track progress, and receive free self-updates to ensure content remains current.
V PUGAZHENTHI
Calculate values instantly
Provides tools for and electronics calculations. Users can compute resistance, voltage, current, and power. Includes resistor color code conversion and voltage drop calculations aligned with NEC/IEEE standards. Supports USCS and SI units.
Oceanhouse Media, Inc.
Read Dr
Read Dr. books with interactive characters and track reading progress with statistics on books read, hours read, pages turned, and words tapped. Access a library of 50 digital books for unlimited reading anywhere.
Calculated Industries, Inc.
Browse boating charts and images
Access boating information with detailed charts, graphs, and illustrations. Look up formulas, safety guidelines, and equipment specifications. Search for content by topic or use the table of contents. View 800+ images and diagrams for visual .
Liang Yuan
Listen to , send messages, make friends
Listen to stations. Connect with others through text, voice messages, and photos. Send custom animated stickers. Receive instant message alerts. Comment on and like shared photos. Participate in chatrooms to converse with users.
Morgan Jones
Learn Code and track your progress
Learn Code using the Koch Method and Farnsworth spacing. Track progress with graphs and results. Practice sending and receiving code. Set training sessions and review speed. Adjust difficulty based on performance.
Verosocial Studio
Calculate locations and dimensions
Calculate Maidenhead locations and HF dimensions. Input frequency and select elements to determine reflector, driven element, director, and spacing sizes in feet, inches, and meters. Convert area measurements between square inches and square feet.
Electronial
Calculate resistor values by color
Toolkit provides resistor calculations based on color codes or SMD values. It includes an LED resistor calculator and parallel resistor tools. Users can reference electronic components and formulas for design and troubleshooting.
Alejandro Martinez de Carvajal
Search navigation instantly anywhere
COLREGs offers flag identification, weather scales, cloud recognition, sound signal guidance, and vessel light details. Users can access navigation , interpret flags, and understand sound and light signals for safe boating.
koji kamogawa
Practice QSOs with realistic calls and signals
Simulate amateur radio QSOs with CQ calls and 59 reports. Exchange phonetic call signs with varying signal levels and tone. Adjust own call sign and monitor TX/RX status. Include pseudo signal meter for realistic feedback.
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