Who posted what? - Search for posts by keyword, within selected date ranges. From Henk van Ess & Daniel Endresz.
Facebook Graph Searcher - Graph Search Generator by Intelligence X. Website has other tools worth checking out.
Graph.tips - Facebook Graph Search Generator by Henk van Ess and Tormund Gerhardsen
LookupID - Finds a Facebook user's unique ID number.
Advanced search - Search using a large variety of filters. The resulting searches can be saved, as well as adjusted within the search box or the url
Google search lists - A custom search that allows you to use Google to search for lists by keyword
Bluesky advanced search - Adds functionality to Bluesky search.
Pack2List - Allows you to convert any Bluesky starter pack to a list.
Toolzu - Tools for viewing & downloading content & profile info
Storysaver - Enables downloading of Instagram stories
Redective - Gives information on Reddit users. Search by username
r/whatisthisthing - Subreddit crowdsourcing identification of objects submitted by users
As yet, I'm not aware of any tools or services specifically targeting TikTok - if you are, let me know.
A targeted Google search can be used to search for accounts, using as the search term names or phrases you think may be used in them
site:tiktok.com name
Google Maps - Maps from Google, including Street View, 3D, Photo Spheres
Google Earth - Browser-based version of Google Earth. Standalone desktop version can be downloaded here
Bing Maps - From Microsoft. Small variations in satellite orbit can mean dramatically different views to Google Maps
Yandex Maps - Particularly useful for Russia and some surrounding countries
OpenStreetMap - Global crowd-sourced maps
Wikimapia - Crowd-sourced maps with descriptive details of locations and very useful filter layers
Mapillary - Crowdsourced street-level imagery
World Imagery Wayback - Historical satellite views from Esri
Open Infrastructure Map - Shows key infrastructure such as power lines, solar installations etc. User-generated
Submarine Cable Map - Searchable map of undersea cables worldwide
Open Railway Map - Map of railway lines worldwide
CarbonBrief Nuclear Map - Shows the location and operating status of nuclear power plants worldwide
Peakfinder - Mountain and hill peaks worldwide, with visual representations
Suncalc.org - Shows the position of the sun at any time and location. See also The Photographer's Ephemeris, which is slightly less intuitive. Very similar to suncalc.org is suncalc.net - but it's not working at the moment after Google made changes to the charges for the Google Maps API.
Shademap - Visualises shadow direction and length for given location, date, and time
Global Gazetteer - List of locations worldwide, with spelling variations in multiple languages and scripts.
Dual Maps - Allows map, satellite, and Street View in Google Maps to be displayed simultaneously
Area Calculator - Gives the area of a shape you draw on a Google map
MapChecking - Helps estimate maximum crowd density for a selected area (French)
Latlong - Converts degrees, minutes and seconds to decimal values, and vice versa
PeakVisor - Provides detailed 3D views of mountains worldwide
MW Metadata - Displays detailed metadata on YouTube videos, as well as the channel on which they're posted.*
TubePilot - Displays detailed metadata on YouTube videos, as well as the channel on which they're posted.*
YouTube GeoFind - Allows searches by location for geotagged YouTube videos.*
InVid - Browser extension that allows an array of analytical functions to be carried out on video and still images.
Watch Frame by Frame - Speed up, slow down or advance YouTube or Vimeo video frame by frame within the browser
Anilyzer - Allows video from YouTube or Vimeo to be played frame by frame or in slow motion
Yandex - Powerful service. Tends to do well on facial recognition relative to other services
Google - Very strong. Comprehensive and has useful filters
Bing - Lags a little behind the big two currently, but has some interesting features, particularly the ability to crop to elements of an image and re-search in real time
TinEye - Making something of a comeback after lagging for a few years. Strong on logos and symbols, and can filter chronologically
Remove Background - Removes the background in an image. Can help reverse search engines focus on main subject
metadata2go.com - Online tool for viewing metadata, including image Exif data (metadata embedded within images), such as camera setting used when taking a photographs, date and location information, and thumbnails. Also can be used for video, and tends to do better on this than other tools
Online EXIF Viewer - Exif viewer - very fast
Jimpl - Exif viewer - can also be used to remove metadata
VerEXIF - Exif viewer - can also be used to remove metadata
Metadata Interrogator - Desktop metadata viewer that works offline and extracts metadata from multiple filetypes
A word of caution: image analysis is quite complex, and I have seen people embarrass themselves by reading too much into the results. Do not expect this to tell you definitively whether a photo is "fake". The creator of FotoForensics warns: 'Any single analysis algorithm can generate noise that may result in a false-positive interpretation. You should confirm your results with other analysis methods. ("Observation" is always a good one, so is "common sense".)'
FotoForensics - Tools for digital picture analysis, including error level analysis, metadata, and tutorials.
Forensically - Digital image forensic analyser
EarthCam - Large directory of live webcams worldwide.
Live World Webcams - Webcams worldwide. Has some locations I haven't seen in other directories.
Windy - Webcams worldwide. Have to enable the webcams layer via the camera icon on the lower right.
WebcamTaxi - Worldwide webcam directory with a user-friendly interface
WXYZ web cams - Webcams worldwide. Doesn't look as slick as some of the big sites, but has some cameras in places others don't.
FxSound - Improves sound quality of audio clips. Desktop app. Windows only
RadarBox24 - Flight tracker with live maps and search function. Displays flight info by default in map view
FlightAware - Flight tracker with live maps and search function
Freedar - Customisable flight tracker that includes military aircraft. Also has monitoring of air traffic control audio
Airportia - Tracks flights, airports and airlines worldwide
AviationDB - Searchable database of info on aviation. This link goes to the very useful Aircraft Query page
Live ATC - Live air traffic control broadcasts
PlaneSpotters - Details on planes worldwide, with a huge collection of photographs
Pinkfroot - User-submitted photographs of planes. Searchable. Also has a section on ships
Airline livery quiz - For practice - can you identify an airline by its livery?
Marine Traffic - Live tracker and database of marine vessels
Vessel Finder - Live tracker of marine vessels
Myshiptracking - Live tracker of marine vessels with information on ports worldwide
Marine Insight ship guide - A guide to different types of ships operating worldwide
Ship prefixes - Wikipedia guide to prefixes used to identify vessels operated by merchant and national navies
Pinkfroot - User-submitted photographs of ships. Searchable. Also has a section on planes
OpenRailwayMap - Crowd-sourced maps showing railways worldwide
Travic - Live public transit vehicle tracking
Live railroad webcams - Live feeds from railroad webcams
Railways of the World - Enthusiast website with a huge amount of information about railways, rail companies etc worldwide
These are generally of use almost entirely for the United States. I've included quite a few as the quality of results tends to vary - different ones are better for different searches, with no obvious consistency.
ThatsThem - People-search tool for US
xlek - US public data search. Formerly known as Cubib
Spokeo - People-search tool for US
Peekyou - People-search tool for US. Looks for social media accounts as well as basic info
Locate Family - People-search website. Has reverse address search
InfoTracer - Background check site. Emphasis on legal records. Includes reverse address search but free info very limited
Infobel - Listings for telephone directories worldwide
Numberway - Listings for telephone directories worldwide
World phone numbers - List of phone number codes worldwide
Hunter - Searches for email addresses on a specified domain
email-format - Searches for email addresses on a specified domain
emailrep.io - Gives information on email addresses, including platforms they have been linked to
FaceCheck - Searches for similar faces
Spyonweb - Finds domains with the same Google Analytics code, AdSense ID, hosting IP etc
DNSlytics - Finds domains with the same Google Analytics code, AdSense ID, hosting IP etc
Whois - Information on registration of domain names. Declining in usefulness due to non-compliance with GDPR
Subdomain Finder - Scans domain and finds subdomains
Followthatpage - Monitors web pages and sends alerts to an email address
Distill - Monitors web pages and sends alerts to an email address
Visualping - Monitors web pages and sends alerts to an email address
Wachete - Monitors web pages and sends alerts to an email address
FluxGuard - Monitors web pages and sends alerts to an email address. The same company provides the similar Versionista
ChangeTower - Monitors web pages and sends alerts to an email address
Web Alert - Mobile (Android) app. Monitors web pages and gives notifications on your device.
Google Alerts - Monitors blogs, news and other websites for new mentions of specified keywords and phrases. Alerts can be sent to email or RSS
Archive.today - Allows archiving of pages and posts, including Facebook
Internet Archive - User-friendly archiving - particularly with the Wayback Machine browser extensions for Chrome and Firefox. Doesn't work on Facebook
Conifer - Formerly known as Webrecorder, an archiving service that asks you to set up your own account to save collections, with 5GB of space free, and also share and download them. Strong on social media.
Video Vault - Preserves online video with downloads and metadata
International Encyclopedia of Uniform Insignia - Military and other uniform badges and insignia from around the world. Also has a discussion forum
Military Factory - Information on military hardware, including weapons and vehicles
Weapons ID Database - Helps in visual identification of weapons. Provided by Small Arms Survey
SKYDB - Database of highrise buildings worldwide with information and photographs
Skyscraper Page - Database of skyscrapers worldwide, some under construction or at planning stage
Brueckenweb - bridges - Website with photos and info on more than 90,000 bridges
Maintenance holes - Pictures of maintenance hole covers from around the world
Time Zone Converter - Find times in different locations worldwide
Unix time stamp converter - Converts Unix time stamps to human readable format and vice versa
Julian Date Converter - Converts Julian date to standard date and vice versa
Calendar converter - Shows dates according to different calendar systems used around the world
xtools - A suite of tools giving analysis of page edits and other activities
Wikimap - Map with a visual representation of geotagged Wikipedia articles
4chan Search - Searches the 4chan boards
Search4chan - Searches the 4chan boards
Archived.moe - Searchable archive of 4chan posts
WhatsMyName - Searches for usernames across platforms. Very fast - and from the people at OSINT Combine, so no concerns about privacy or security issues.
Instant Username - Searches for usernames across platforms.
Namechk - Searches for usernames across platforms
NameCheckup - Searches for usernames across platforms