commentpicker.com
Finds the channel ID behind a YouTube channel name, handle, or channel URL.
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asif633.github.io
Searches YouTube channels by keyword and returns matching channel IDs, names, and links.
mattw.io
A bulk metadata tool that gathers details about multiple YouTube videos, a playlist's videos, or a channel's public videos from the YouTube API. It accepts comma or whitespace separated lists of video, playlist and channel URLs or IDs, and exports results as a zip file.
leakix.net
LeakIX is a search and reporting platform with query syntax for ports, protocols, ASNs and IP ranges. It offers free and commercial plans, with paid tiers providing faster access to results, higher request limits, critical and RCE plugins, alert channels and downloadable results. Sponsorship supports voluntary researchers who dispatch free reports to companies and institutions.
vremsoftwaredevelopment.github.io
WiFiAnalyzer is an official Android open-source application for analyzing Wi-Fi signals. It identifies nearby access points, graphs channel signal strength and access point signal strength over time, and rates channels. It supports 2.4, 5 and 6 GHz bands where hardware and software permit, offers filters and a vendor lookup, and is licensed under GPLv3.